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Energy transfer between Ce3+ and Tb3+ and the enhanced luminescence of a green phosphor SrB2O4:Ce3+, Tb3+, Na+

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Abstract

A series of Ce3+ or Tb3+ doped and Ce3+, Tb3+, and Na+ co-doped SrB2O4 phosphors were synthesized by solid-state reaction method. Luminescence intensity was increased as M+ (M+ = Li+, Na+, K+) ions were used to compensate the valance in SrB2O4:Ce3+, in which the charge compensation by Na+ ion in SrB2O4:Ce3+ showed the strongest luminescence intensity. When the content of Ce3+ was fixed at 2 mol. % by tuning the contents of Tb3+ ions from 1 mol. % to 10 mol. %, SrB2O4:0.02Ce3+, yTb3+, zNa+ showed both an emission (360 nm) from Ce3+ and a yellowish-green emission (541 nm) from Tb3+, which disclose that an effective energy transfer from Ce3+ to Tb3+ exists in the phosphor. The energy transfer efficiency reaches as high as 80.2% for a Tb3+ concentration of 10 mol. %. The QE of SrB2O4:0.02Ce3+,0.03Tb3+, SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphors are 41.3% and 54.7% excited at 319 nm. The energy transfer mechanism was proved to be dipole–dipole interaction. The CIE chromaticity coordinates of the optimized SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor, which were thermal stable revealed by temperature-dependent PL results, were calculated to be (0.3035, 0.4812).

© 2016 Optical Society of America

1. Introduction

White-light emitting diode (w-LED) has attracted increasing attention because of its superior advantages, such as energy saving, high energy efficiency, environmental friendliness, and long operation time [1–6 ]. The traditional method used to obtain wLEDs is to combine a GaN blue LED chip with yellow phosphor YAG:Ce3+. However, the deficiency of red emission results in low color-rendering index (CRI<80) and high correlated color temperature (CCT>7000 K), which are important parameters for its application. An alternative way is to combine red, green and blue tricolor phosphors with a GaN/ InGaN chip, which can produce warm white-light emission with high CRI and good color uniformity. Thus, to study the luminescence properties is very important for exploring the new phosphors, especially the UV or NUV converted phosphors [7–11 ].

Tb3+ ion is widely used as an important activator for luminescent materials. It emits blue light with low doping concentration and strong green light with high doping concentration because of the transitions of 5D37FJ and 5D47FJ (J = 6, 5, and 3), respectively. However, the Tb3+ ion exhibits weak absorption in the range of 300–410 nm because 4f–4f transitions are forbidden by the parity selection rule, suggesting that it does not match well with a UV chip. One of the strategies to enhance the intensity of Tb3+ emission is co-doping with ions which show broad absorption and emission bands, such as Ce3+ or Eu2+. Ce3+ has a strong excitation band that originates from parity-allowed 4f–5d transitions, which can efficiently absorb the NUV light and transfer the excitation energy to Tb3+, and thus resulting in strong sensitized green emission [12–15 ]. Up-to-now, some Ce3+ and Tb3+ co-doped phosphors have been reported, such as Lu2Al5O12:Ce3+, Tb3+ [16], NaCaBO3:Ce3+, Tb3+ [17], Ca2Al3O6F:Ce3+, Tb3+ [18], AlN:Ce3+, Tb3+ [19].

SrB2O4 was firstly reported by J. B. Kim [20]. It crystallizes in the orthorhombic space group Pnca with lattice parameters a = 6.589 Å, b = 12.018 Å, and c = 4.3373 Å. Though the energy transfer between Ce3+ to Tb3+ has been studied in some borates phosphors, they normally consist of (BO3)3- or (BO4)5- group. In this compound, however, the functional group is (B2O4)n 2n-, which will afford different crystal field environment. Thus, studying the energy transfer from Ce3+ to Tb3+ in SrB2O4 is very important to enlarge the knowledge on the energy transfer from Ce3+ to Tb3+. Considering the charge balance of the Ce3+, Tb3+doped phosphor, alkali metal ions, as described in Ref [21], Li+, Na+ and K+, are codoped into the SrB2O4:xCe3+, yTb3+ to compensate the charge unbalance. In this study, Sr1-x-y-zB2O4:xCe3+, yTb3+, zNa+ (x = 0-0.07, y = 0-0.10, z = 0-0.12) were synthesized by solid stated reaction method. The structure analysis and the photoluminescence properties of all these samples have been studied. The energy transfer from Ce3+ to Tb3+ in this compound has also been elucidated.

2. Experimental

2.1. Samples preparation

The Sr1-xB2O4:xCe3+ (0.00≤x≤0.07), SrB2O4:0.02Ce3+, 0.02M+ (M = Li+, Na+, K+), SrB2O4:0.03Tb3+, Sr1-x-y-zB2O4:xCe3+,yTb3+,zNa+ powder samples were synthesized by a conventional solid-state reaction. CeO2 (99.95%), Tb4O7 (99.99%), SrCO3 (A.R.), Li2CO3 (A.R.), Na2CO3 (A.R.), K2CO3 (A.R.) and H3BO3 (A.R.) were used as starting materials. The materials were weighed and ground in an agate mortar. The mixtures of BaCO3, Y2O3 and H3BO3 (excess 10 mol. %) were first heated at 600 °C for 20 h to decompose H3BO3 and BaCO3, and then reground and heated in a platinum crucible at 900 °C for 48 h. The obtained samples were sintered at 900 °C for 6 h in the reducing atmosphere of H2 (15%) + Ar (85%).

2.2. Characterizations

The phase identification of as-prepared powders was checked at room temperature by a PANalytical X’Pert Pro powder X-ray diffractometer with Cu-Kα radiation (40 kV, 40 mA). Diffuse reflectance spectra were measured by a UV-visible spectrophotometer (Hitachi U-4100) using white BaSO4 powder as a reference standard. Photoluminescence (PL) and photoluminescence excitation (PLE) spectra were measured by a FLS920 Fluorescence Spectrometer (Edinburgh Instruments) equipped with a Xe light source and double excitation monochromators. The lifetimes were recorded using a hydrogen lamp as a light source and a photomultiplier (R928P) was used as detector. The temperature-dependent luminescence properties were measured on a fluorescence spectrophotometer (F-4600, HITACHI, Japan) with a photomultiplier tube operated at 400 V and a 150 W Xe lamp used as the excitation lamp. The internal quantum efficiency of optimized-composition phosphor SrB2O4:0.02Ce3+, 0.03Tb3+, SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ was determined on an FLS920 spectrometer under excitation of 319 nm.

3. Results and discussion

3.1. Phase of the as-grown phosphor

The XRD patterns of the SrB2O4:xCe3+, yTb3+, zNa+ are shown in Fig. 1(a) . All the patterns are well consistent with that of SrB2O4 (ICSD #203226) [20] besides two very small peaks of TbBO3 (JCPDS No. 24-1272) indexed in the Fig. 1(a) as the doped content is high. The impurity does not affect the result of the experiment because it cannot be activated under 319 nm [22]. As introduced above, SrB2O4 crystallizes in the orthorhombic space group Pnca with lattice parameters a = 6.589 Å, b = 12.018 Å, and c = 4.3373 Å. The crystal structure of SrB2O4 is shown in Fig. 1(b). It consists of slightly puckered layers with the composition of (B2O4)n 2n- and each Sr2+ atom is coordinated by eight O atoms from neighbouring (B2O4)n 2n- layers. There are only two cations in the host, Sr2+ and B3+. The radius of B3+ is much smaller than that of Ce3+ and Tb3+, thus the doped ions will not occupy B3+ site. As reported by Shannon [23], the effective ionic radius (r) of Sr2+ is 1.26 Å as the coordination number (CN) equals to 8, while rCe 3+ = 1.143 Å, rTb 3+ = 1.04 Å, rNa + = 1.18 Å, rK + = 1.51 Å, rLi + = 0.92 Å as CN = 8. Considering the charge balance as well as the crystal environment of the cations, the doped cations are expected to occupy the Sr2+ sites, that is the doped Ce3+, Tb3+ and Na+ is coordinated by eight O2-. The crystal environment of the doped ions is shown in Fig. 2(b) .

 figure: Fig. 1

Fig. 1 (a) XRD patterns of samples SrB2O4:xCe3+, yTb3+, zNa+. (b) Crystal structure of SrB2O4 (along Z axis) and the coordination environment of Sr with O atoms (M+ = Li+, Na+, K+).

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 figure: Fig. 2

Fig. 2 Diffuse reflection spectra of sample SrB2O4:xCe3+, yTb3+, zNa+.

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3.2. Diffuse reflection spectra of Sr1-x-y-zB2O4:xCe3+, yTb3+, zNa+ powder samples

Figure 2 shows the diffuse reflection spectra of Sr1-x-y-zB2O4:xCe3+, yTb3+, zNa+ powder samples. The absorption around 237 nm and 340 nm are attributed to the typical 4f→5d transition of Tb3+ and Ce3+, respectively. As doped by Ce3+, the absorption around 340 nm is very strong, while the absorption of Tb3+ is low as the host doped by these ions. However, the absorption of Tb3+ increases greatly with the Tb3+ co-doping concentrations changing from 0 mol. % to 10 mol. % when the Ce3+ doping concentration is fixed on 2 mol. %.

3.3. Photoluminescence properties of Sr1-xB2O4:xCe3+

Figure 3 shows the PLE and PL spectra of SrB2O4:0.02Ce3+ phosphor. The excitation spectrum consists of broad absorption bands located in the range of 3.8-5 eV (250-320 nm), which is attributed to the 4f-5d transition of Ce3+ ions. The transition at about 319 nm shows the maximum intensity. The PL spectrum exhibits a strong asymmetric broad emission band from 2.7 eV (450 nm) to 3.8 eV (325 nm) centered at 360 nm, which corresponds to the transitions from the lowest 5d level to the spin-orbit split 2F5/2 and 2F7/2 states of the 4f1 configuration [12], The emission spectrum can be fitted into two peaks centered at A (3.28 eV, 378 nm) and B (3.52 eV, 352 nm) by Gaussian fitting, labeled as bands A and B. The energy gap between the bands A and B is 0.24 eV (1936 cm−1), which is in good agreement with the theoretical value of Ce3+ (2000 cm−1) [12,18 ]. As seen in the inset of Fig. 3, the emission intensity increases with the increasing doping concentration until reaching a maximum of 2 mol. %. After that, the intensity decreases because of the concentration quenching.

 figure: Fig. 3

Fig. 3 The PLE and PL spectra of phosphor SrB2O4:0.02Ce3+. The dotted lines A and B are double-peak fitting of Ce3+ by Gauss fitting. The inset is photoluminescence intensities of SrB2O4:xCe3+ as a function of Ce3+ contents.

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The normalized emission bands of the SrB2O4:xCe3+ (x = 0.005–0.07) phosphors indicate that the emission wavelength of Ce3+ shows a red shift with increasing doping concentration, as shown in Fig. 4(a) . The inset in Fig. 4(a) shows clearly a red shift of about 12 nm in the emission spectra according to the barycentric wavelength when the x value increases from 0.005 to 0.07, which is mainly ascribed to the expansion of the crystal coordination. As the Sr2+ ion with large radius is substituted by the Ce3+ ion with small radius, the small Sr2+ ion will results in a lattice contraction and results in an increase of the crystal field. Meanwhile, reabsorption and clustering can also lead to a red shift in Ce3+ doped phosphor. As a consequence, the emission energies of Ce3+ ions decrease [24, 25 ]. Considering of the charge balance of the Ce3+ doped phosphor, alkali metal ions, Li+, Na+ and K+, are codoped into the SrB2O4:0.02Ce3+ to compensate the charge unbalancing. The PL emission spectra of SrB2O4:0.02Ce3+, 0.02M+ (M+ = L{Xia, 2013 #417}i+, Na+, K+) are shown in Fig. 4(b). Obviously the luminescent intensity of SrB2O4:Ce3+ is significantly enhanced as codoped Li+, Na+, or K+ ion. Besides, an obvious red shift can be observed in the emissions of the phosphors with charge compensators and increase in the order of SrB2O4:0.02Ce3+, 0.02Na+ < SrB2O4:0.02Ce3+, 0.02K+ < SrB2O4:0.02Ce3+, 0.02Li+. It is well known that the ionic radius of Li+, Na+, and K+ are 0.92 Å, 1.18 Å, and 1.51 Å, respectively as CN = 8. Thus the ionic radius differences of △1 = Na+- Sr2+, △2 = K+- Sr2+ and △3 = Li+- Sr2+ are 0.08 Å, 0.25 Å and 0.34 Å, respectively, which results in the crystal field with different strength in the order of SrB2O4:0.02Ce3+, 0.02Na+ < SrB2O4:0.02Ce3+, 0.02K+ < SrB2O4:0.02Ce3+, 0.02Li+.So the red shift induced by emission energy decreasing can be seen in the same order. Besides, the intensity of the luminescent emission of the phosphor codoped by Li+, Na+, and K+ has the same variation because of the difference of the crystal field strength from Li+, Na+, and K+.

 figure: Fig. 4

Fig. 4 (a) The normalized emission bands of the SrB2O4:xCe3+ phosphors (λex = 319 nm). The inset is the maximum wavelength for each of the SrB2O4:xCe3+ phosphors (λex = 319 nm). (b) The emission bands of the SrB2O4:0.02Ce3+, 0.02M+ (M+ = Li+, Na+, K+) (λex = 319 nm).

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3.4. Energy transfer from Ce3+ to Tb3+

Figure 5(a) shows the PLE and PL spectra of SrB2O4:0.02Ce3+ and Fig. 5(b) is the PLE and PL spectra of SrB2O4:0.03Tb3+. The absorption peaks in the range of 250-300 nm in Fig. 5(b) is attributed to the allowed 4f–5d transition of Tb3+, while the absorptions from 300 to 400 nm is assigned to the f–f transitions of Tb3+. The PL spectrum shows a series of sharp line emissions at 486, 541, 582, and 620 nm due to the 5D47FJ (J = 6, 5, 4 and 3) characteristic transitions of Tb3+ ions [17, 26 ]. The comparison of the PL spectrum of SrB2O4:Ce3+ and PLE spectrum of SrB2O4:Tb3+ reveals an obvious spectral overlap between the emission band of Ce3+ centered at 360 nm and the excitation transitions of Tb3+ from 330 to 400 nm. Therefore, an effective resonance-type energy transfer from Ce3+ to Tb3+ is expected. Figure 6 shows a comparison of PLE and PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+(a) and the PLE spectrum of SrB2O4:0.03Tb3+ (b). When excited at 319 nm, the PL spectrum of SrB2O4:0.02Ce3+, 0.03Tb3+ exhibits both a strong asymmetric broad emission band from 320 to 450 nm which belongs to the 5d-4f transitions of Ce3+ ions and a series of sharp line emissions at 486, 541, 582 and 620 nm due to the 5D47FJ (J = 6, 5, 4 and 3) characteristic transitions of Tb3+ ions, implying an efficient energy transfer (ET) from Ce3+ to Tb3+. Moreover, the PLE spectra of the SrB2O4:0.02Ce3+, 0.03Tb3+ exhibit two broad peaks with similar shape centered at about 319 nm when monitored at 360 and 541 nm, respectively, which is obviously different from SrB2O4:0.03Tb3+ (the red dotted line), it further demonstrates the ET process from Ce3+ to Tb3+.

 figure: Fig. 5

Fig. 5 The excitation and emission spectra of SrB2O4:0.02Ce3+ (a) and SrB2O4:0.03Tb3+ (b).

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 figure: Fig. 6

Fig. 6 The PLE and PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+ (a) and the PLE spectrum of SrB2O4:0.03Tb3+ (b) (for comparison, the red dotted line is timed by 30).

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In order to improve the luminescent intensity, Na+ codoped SrB2O4:0.02Ce3+, 0.03Tb3+ phosphor is prepared because Na+ ions exhibit the strongest charge compensation ability, as shown in Fig. 4. A comparison of the PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ and SrB2O4:0.02Ce3+, 0.03Tb3+ phosphors on the excitation of 319 nm are shown in Fig. 7 . Obviously the emissions are enhanced significantly with Na+ compensator. The inset of Fig. 7 shows the measured and simulated broad emission (2.8-3.8 eV) spectra and decomposed Gaussian components. The decomposed peaks are centered at 3.33 eV (372 nm) and 3.58 eV (346 nm), respectively and labeled as bands C and D with an energy gap of 0.25 eV (2020 cm−1), which is in good agreement with the theoretical value of 2000 cm−1.

 figure: Fig. 7

Fig. 7 The PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ and SrB2O4:0.02Ce3+, 0.03Tb3+ phosphors (λex = 319 nm). The inset is the double-peak fitting of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ (2.8-3.5 eV) by Gauss fitting.

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A series of phosphors are prepared to investigate the energy transfer between Ce3+ and Tb3+. The emission spectra of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors under 319 nm excitation are shown in Fig. 8(a) . The Ce3+ emission intensity decreases monotonously with the Tb3+ doping concentrations increasing from 0 mol. % to 10 mol. % while the Ce3+ doping concentration is fixed at 2 mol. %. In contrast, the sharp emission of Tb3+ corresponding to the 5D47FJ transitions increases with the increasing doping concentration until reaching a maximum when y = 3 mol. %. The intensity of the emission peak of Tb3+ decreases as the content of Tb3+ (y) is beyond 3 mol. % because of the increasing mutual interaction between the two nearby Tb3+ ions with increasing content of the activator ions. The energy transfer efficiency ηT from Ce3+ to Tb3+ can be expressed by [12]

ηT=1Is/Iso
where Iso and Is are the luminescent intensity of a sensitizer (Ce3+) in the absence and presence of an activator (Tb3+), respectively. The obtained results of ηT as a function of Tb3+ concentrations are plotted in Fig. 8(b), in which ηT increases gradually with increasing Tb3+ concentration and reaches to 80.2% for a Tb3+ concentration of 10 mol. %.

 figure: Fig. 8

Fig. 8 (a) The emission spectra of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors (λex = 319 nm). (b) The normalized emission intensity of Ce3+ (5d-4f) and Tb3+ (5D47FJ) as a function of Tb3+ contents and the intensities of ηET as a function of Tb3+ contents.

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Generally, two main aspects are considered to be responsible for the resonant energy-transfer mechanism: one is exchange interaction and another one is multi-polar interaction. The exchange interaction energy transfer occurs when the critical distance between sensitizer and activator is shorter than 5 Å [11, 12 ]. Blasse suggests the critical distance RCe–Tb can be obtained using the following equation [27]:

RCeTb2[3V4πxcZ]13
where V is the volume of the unit cell, xc is the critical concentration, at which the luminescence intensity of Ce3+ reduces to half of that for the sample without Tb3+, and Z is the number of formula units per unit cell. For SrB2O4 host, Z = 4 and V = 343.33 Å3 [20]. The critical concentration in this study is xc≈0.02 + 0.025 = 0.045. Consequently, the critical distance (RCe-Tb) of energy transfer is about 15.4 Å, which is much larger than 5 Å, indicating that the energy transfer should be the multi-polar interaction mechanism.

To further verify the mechanism of ET from Ce3+ to Tb3+, the relationship between the emission intensity of sensitizer and the doping concentration can be approximately demonstrated by using Dexter's formula of multipolar interaction and Reisfeld's approximation as follows [28]:

IsoIsCn/3
where Iso is the intrinsic luminescent intensity of Ce3+, Is is the luminescent intensity of Ce3+ in the presence of Tb3+ and the factor C is the sum doping concentration of Ce3+ and Tb3+ ions. In the above expression, n = 6, 8, and 10, corresponding to dipole-dipole, dipole–quadrupole, and quadrupole–quadrupole interactions, respectively. The Iso/IsCn/3 curves (n = 6, 8 and 10) are plotted in Fig. 9 . The R2 value of the nonlinear curve fit in Fig. 9(a) is estimated to be 0.9709. This value indicates that the curve is most similar to the linear relation when n = 6, suggesting that the energy transfer from the Ce3+ to Tb3+ ions is the dipole-dipole mechanism. Therefore, the dipole-dipole interaction is the main energy transfer mechanism in Sr1-x-y-zB2O4:xCe3+, yTb3+, zNa+.

 figure: Fig. 9

Fig. 9 Dependence of Iso/Is of Cn/3 on the exponent (a) n = 6, (b) n = 8 and (c) n = 10.

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For luminescence application, the quantum efficiency (QE) of a phosphor is often regarded as a measure of its merit. The value of QE can be determined by the integrated method and calculated by the equation [29]:

QE=Pc(1Adir)PbLaAdir
where Pc is the number of photons in the emission wavelength region with sample present in the sphere and in the path of the incident beam, and Pb is the number of photons in the emission wavelength region with the sample present in the sphere, out of the path of the incident beam. The term La the integrated excitation profile obtained from the empty integrated sphere (without the sample present). The direct absorbance Adir can also be calculated by using the equation:
Adir=1LcLb
where Lb is the number of photons in the incident wavelength region with the sample present in the sphere but out of the path of the incident beam, and Lc is the number of photons in the incident wavelength region with the sample present in the sphere, directly illuminated by the incident beam. The QE of SrB2O4:0.02Ce3+, 0.03Tb3+, SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphors are determined as 41.3% and 54.7% under 319 nm excitation, respectively. Obviously the QE of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ is significantly large than that of SrB2O4:0.02Ce3+, 0.03Tb3+ due to charge compensation of Na+ ion.

To verify an energy transfer existing from Ce3+ to Tb3+, the decay curves of samples SrB2O4:0.02Ce3+, yTb3+, zNa+ (y = 0.00-0.05, z = 0.02-0.07) excited at 319 nm and monitored at 360 nm were measured and shown in Fig. 10 . The luminescent decay curves can be well fitted with a first-order exponential equation described by Blasse and Grabmaier [30]:

I=I0exp(tτ)
where I0 and I are the luminescent intensities at time t = 0 and t = t, respectively, and τ is the fluorescence lifetime. The fact that all the decay curves can be fitted well by single exponential equation confirms that the Ce3+ and Tb3+ ions occupy only one Sr2+ site, which is in accordance with the previous structural discussion. The decay time of Ce3+ is found to decrease from 26.50 ns (y = 0.00) to 24.89 ns (y = 0.05) with an increasing concentration of Tb3+ ions, which indicates that the co-doping Tb3+ ions modify the fluorescent dynamics of the Ce3+ ions and give an evidence for the energy transfer from Ce3+ to Tb3+ in the SrB2O4 matrix. However, the decrease of decay time is not particularly large, which is possibly ascribed to the superposition of Ce3+ and Tb3+ emission (5D3-7F6 transition with longer lifetime) [31] or the doping concentration of Tb3+ is too small in comparison to NaCaBO3:Ce3+, Tb3+ [17].

 figure: Fig. 10

Fig. 10 Photoluminescence decay curves of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors.

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3.5. CIE coordinates of SrB2O4:xCe3+, yTb3+, zNa+ phosphors

The CIE chromaticity coordinates of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors under 319 nm excitation and SrB2O4:0.03Tb3+ excited at 258 nm were calculated from the emission spectra and presented in Table 1 . Figure 11 shows the CIE chromaticity coordinates of SrB2O4:0.02Ce3+, 0.02Na+ (A), SrB2O4:0.02Ce3+, 0.03Tb3+ (C), SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ (D) excited at 319 nm and the coordinates of SrB2O4:0.03Tb3+ (B) excited at 258 nm. The emitting color of phosphor can be tuned from blue to green by changing the codoping Tb3+ ions. The CIE chromaticity coordinates of the optimized SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor is calculated to be (0.3035, 0.4812), located in the green region. Obviously the SrB2O4:xCe3+, yTb3+, zNa+ phosphor can be efficiently excited via NUV light to emit strong green light.

Tables Icon

Table 1. The CIE Chromaticity Coordinates of SrB2O4:xCe3+, yTb3+, zNa+ under the excitation of 319 nm UV and SrB2O4:0.03Tb3+ excited at 258 nm.

 figure: Fig. 11

Fig. 11 CIE chromaticity coordinates of SrB2O4:0.02Ce3+, 0.02Na+ (A), SrB2O4:0.02Ce3+, 0.03Tb3+ (C), SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ (D) (λex = 319 nm) and the CIE chromaticity coordinates of SrB2O4:0.03Tb3+ (B) under (λex = 258 nm).

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3.6. Temperature-dependent PL properties of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+

Figure 12(a) shows the temperature-dependent PL spectra (λex = 319 nm) of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ at the temperature range of 25–300 °C. The blue emission peaks at different temperatures show a similar shape with a slight red shift, as shown in Fig. 12(b). The red shift of the blue emission band is because of the enhancement of the thermal vibration of the host lattice with increasing temperature, which enhances the crystal field splitting and decreases splitting energy of Ce3+ (5d-4f). However, the green emission peaks at different temperatures show a similar shape and barely move. These phenomena are attributed to the 5d–4f emissions of the Ce3+ ion which depends strongly on the crystal field, while the 4f–4f emissions of the Tb3+ ion is almost unaffected by the crystal field. As it can be seen from Fig. 12(c), the intensities of the emission of Ce3+ and Tb3+ ion are decrease with the temperature increasing and the speed of attenuation is similar, which implies the SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor has a good color purity. Compared with the intensity of the emission peak at room temperature, the intensities of the green emission peak at 75 °C and 150 °C remained about 81.6% and 59.3%, respectively, which indicates that this phosphor has a good thermal stability.

 figure: Fig. 12

Fig. 12 (a) The temperature-dependent PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ex = 319 nm). (b) The normalized emission bands of Ce3+ (5d-4f) as a function of temperature contents. (c) The intensity of the emission of Ce3+ and Tb3+ ion as a function of temperature contents. (d) The ln(I0/IT −1) vs. 1/kT activation energy graph for thermal quenching of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+.

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The decrease of the emission intensity of the phosphors at different temperature can be described by the Arrhenius Equation [32, 33 ]:

IT=I0/[1+exp(Ea/kT)]
where I0 and IT are the green luminescent intensities of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ at room temperature and the measuring temperature, respectively. Ea is activation energy and k is the Boltzmann constant (8.617 × 10−5 eV K−1). Therefore, Ea can be calculated from the slope of the plot of ln(I0/IT −1) vs. 1/kT. As is displayed in Fig. 12(d), Ea of Ce3+ and Tb3+ ion are obtained to be 0.28 eV and 0.21 eV respectively, which also indicate that the SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor has good thermal stability.

4. Conclusion

In summary, a novel phosphor SrB2O4:Ce3+, Tb3+, Na+ was synthesized through solid state reaction method. The doped Ce3+, Tb3+, Na+ ions occupy one emission center of Sr2+ site in SrB2O4 host. The phosphors can be efficiently excited by near-ultraviolet light with the wavelength of 319 nm and emit bright green light with good color purity. The co-doped alkali metal ions can obviously enhance the intensity of the luminescence peak. An effective energy transfer from Ce3+ to Tb3+ exists in the phosphor. The energy transfer efficiency reaches as high as 80.2% for a Tb3+ concentration of 10 mol. %. The critical distance was calculated to be 15.4 Å and the ET from the Ce3+ to Tb3+ ions had been demonstrated to be a resonant type via the dipole–dipole interaction mechanism in the SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor. The 5d–4f emissions of the Ce3+ ion depends strongly on the crystal field while the 4f–4f emissions of the Tb3+ ion is the opposite by analyzing the temperature-dependent PL spectra. The QE of SrB2O4:0.02Ce3+, 0.03Tb3+, SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphors are 41.3% and 54.7% under 319 nm excitation, respectively. Compared to the intensity of the emission peak at room temperature, the green emission intensities at 75 °C and 150 °C remained about 81.6% and 59.3%. The CIE chromaticity coordinate of the optimized SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ phosphor was calculated to be (0.3035, 0.4812), which indicates that the SrB2O4:Ce3+, Tb3+, Na+ phosphor had a good thermal stability and stable CIE coordinates.

Acknowledgments

This work was financially supported by National Natural Science Foundation of China (51372121, 61274053, 51572132, U146020005, 91222111 and 51572132), and Tianjin Research Program of Application Foundation and Advanced Technology (14JCYBJC17800, 12JCYBJC10900). It was also supported by International Science and Technology Cooperation Program of China (2013DFG52660), and National Basic Research Program of China (2013CB328706).

References and links

1. S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994). [CrossRef]  

2. T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003). [CrossRef]  

3. E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005). [CrossRef]   [PubMed]  

4. T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007). [CrossRef]   [PubMed]  

5. L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012). [CrossRef]  

6. J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014). [CrossRef]  

7. Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014). [CrossRef]  

8. P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997). [CrossRef]  

9. R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012). [CrossRef]   [PubMed]  

10. C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013). [CrossRef]  

11. Y. X. Pan and G. K. Liu, “Enhancement of phosphor efficiency via composition modification,” Opt. Lett. 33(16), 1816–1818 (2008). [CrossRef]   [PubMed]  

12. Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014). [CrossRef]  

13. B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013). [CrossRef]  

14. J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010). [CrossRef]  

15. C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012). [CrossRef]   [PubMed]  

16. J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012). [CrossRef]   [PubMed]  

17. X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015). [CrossRef]  

18. Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012). [CrossRef]  

19. W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014). [CrossRef]  

20. J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996). [CrossRef]  

21. Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015). [CrossRef]  

22. J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008). [CrossRef]   [PubMed]  

23. R. Shannon, “Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides,” Acta Crystallogr. 32(5), 751–767 (1976). [CrossRef]  

24. Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013). [CrossRef]   [PubMed]  

25. Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013). [CrossRef]   [PubMed]  

26. X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014). [CrossRef]   [PubMed]  

27. G. Blasse, “Energy transfer in oxidic phosphors,” Philips Res. Rep. 24(2), 131–144 (1969).

28. G. Blasse, “Energy transfer between inequivalent Eu2+ ions,” J. Solid State Chem. 62(2), 207–211 (1986). [CrossRef]  

29. S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014). [CrossRef]   [PubMed]  

30. G. Blasse and B. Grabmarier, Luminescent Materials (Springer-Verlag, 1994).

31. D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014). [CrossRef]  

32. H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012). [CrossRef]  

33. R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

References

  • View by:

  1. S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
    [Crossref]
  2. T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
    [Crossref]
  3. E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
    [Crossref] [PubMed]
  4. T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
    [Crossref] [PubMed]
  5. L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
    [Crossref]
  6. J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014).
    [Crossref]
  7. Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
    [Crossref]
  8. P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
    [Crossref]
  9. R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
    [Crossref] [PubMed]
  10. C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
    [Crossref]
  11. Y. X. Pan and G. K. Liu, “Enhancement of phosphor efficiency via composition modification,” Opt. Lett. 33(16), 1816–1818 (2008).
    [Crossref] [PubMed]
  12. Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
    [Crossref]
  13. B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
    [Crossref]
  14. J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
    [Crossref]
  15. C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
    [Crossref] [PubMed]
  16. J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
    [Crossref] [PubMed]
  17. X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
    [Crossref]
  18. Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012).
    [Crossref]
  19. W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
    [Crossref]
  20. J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
    [Crossref]
  21. Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
    [Crossref]
  22. J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
    [Crossref] [PubMed]
  23. R. Shannon, “Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides,” Acta Crystallogr. 32(5), 751–767 (1976).
    [Crossref]
  24. Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
    [Crossref] [PubMed]
  25. Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013).
    [Crossref] [PubMed]
  26. X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014).
    [Crossref] [PubMed]
  27. G. Blasse, “Energy transfer in oxidic phosphors,” Philips Res. Rep. 24(2), 131–144 (1969).
  28. G. Blasse, “Energy transfer between inequivalent Eu2+ ions,” J. Solid State Chem. 62(2), 207–211 (1986).
    [Crossref]
  29. S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
    [Crossref] [PubMed]
  30. G. Blasse and B. Grabmarier, Luminescent Materials (Springer-Verlag, 1994).
  31. D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
    [Crossref]
  32. H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
    [Crossref]
  33. R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

2015 (2)

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

2014 (7)

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014).
[Crossref] [PubMed]

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014).
[Crossref]

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

2013 (4)

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
[Crossref] [PubMed]

Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013).
[Crossref] [PubMed]

2012 (6)

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012).
[Crossref]

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

2010 (1)

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

2008 (2)

Y. X. Pan and G. K. Liu, “Enhancement of phosphor efficiency via composition modification,” Opt. Lett. 33(16), 1816–1818 (2008).
[Crossref] [PubMed]

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

2007 (2)

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

2005 (1)

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[Crossref] [PubMed]

2003 (1)

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
[Crossref]

1997 (1)

P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
[Crossref]

1996 (1)

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

1994 (1)

S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
[Crossref]

1986 (1)

G. Blasse, “Energy transfer between inequivalent Eu2+ ions,” J. Solid State Chem. 62(2), 207–211 (1986).
[Crossref]

1976 (1)

R. Shannon, “Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides,” Acta Crystallogr. 32(5), 751–767 (1976).
[Crossref]

1969 (1)

G. Blasse, “Energy transfer in oxidic phosphors,” Philips Res. Rep. 24(2), 131–144 (1969).

Agathopoulos, S.

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Ban, T.

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
[Crossref]

Blasse, G.

G. Blasse, “Energy transfer between inequivalent Eu2+ ions,” J. Solid State Chem. 62(2), 207–211 (1986).
[Crossref]

G. Blasse, “Energy transfer in oxidic phosphors,” Philips Res. Rep. 24(2), 131–144 (1969).

Chen, L.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

Coutino-Gonzalez, E.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Deconinck, G.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Du, G. P.

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Durinck, G.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Enrichi, F.

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

Fang, Z.

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

Gong, M.

X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014).
[Crossref] [PubMed]

Gong, M. L.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Gui, M. Y.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Guo, C.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Hanselaer, P.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Hao, L. Y.

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Hashimoto, T.

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

He, P.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Hirosaki, N.

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

Hofkens, J.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Hu, Q.

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

Hu, W. W.

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Hu, Y. H.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

Huang, Y.

Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
[Crossref] [PubMed]

Huang, Z.

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

Ivanovskikh, K. V.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Jang, K.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Jayasimhadri, M.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Jeong, J. H.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Jin, Y. H.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Jing, H.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Joos, J. J.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Ju, G. F.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Jüstel, T.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Kim, J. B.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Kim, J. K.

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[Crossref] [PubMed]

Kim, S. S.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Kimura, N.

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

Kobayashi, N.

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
[Crossref]

Kong, Y. F.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Kuang, X.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Kumar, G. B.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Lee, J. H.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Lee, K. S.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Lee, Y. I.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Leyre, S.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Li, C.

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

Liang, H.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Lim, J. M.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Lin, J.

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

Liu, C.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Liu, G. K.

Liu, R. S.

Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012).
[Crossref]

Liu, X. F.

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Lu, P. Z.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Luo, A.

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Marin, R.

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

Meijerink, A.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Meuret, Y.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Mitomo, M.

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

Mu, Z. F.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Mukai, T.

S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
[Crossref]

Nakamura, S.

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
[Crossref]

Nishida, T.

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
[Crossref]

Ogieglo, J. M.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Pan, Y. X.

Pang, Q.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Pank, J. R.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Poelman, D.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Qin, X. M.

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Qin, X. Z.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Qiu, J. R.

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Ratman, B. V.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Riello, P.

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

Ronda, C. R.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Ryckaert, J.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Sakuma, K.

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

Schlotter, P.

P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
[Crossref]

Schmidt, R.

P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
[Crossref]

Schneider, J.

P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
[Crossref]

Schubert, E. F.

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[Crossref] [PubMed]

Senoh, M.

S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
[Crossref]

Seo, H. J.

Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
[Crossref] [PubMed]

Shannon, R.

R. Shannon, “Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides,” Acta Crystallogr. 32(5), 751–767 (1976).
[Crossref]

Shi, J.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Shi, W. Z.

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Shin, D. S.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Shin, Y. H.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Smet, P. F.

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Song, T. K.

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

Speck, J. S.

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

Sponchia, G.

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

Su, Q.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Su, X.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Suh, I. H.

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Sulcis, R.

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

Sun, S.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Tao, Y.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Tao, Z.

Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
[Crossref] [PubMed]

Teng, Y.

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Tian, S.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Wang, L.

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

Wang, X. J.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

Wen, D.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Wu, C. L.

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Wu, F.

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

Wu, L.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Wu, M.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Wu, W.

Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013).
[Crossref] [PubMed]

Xia, Z.

Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013).
[Crossref] [PubMed]

Xia, Z. G.

J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014).
[Crossref]

Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012).
[Crossref]

Xie, R. J.

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

Xu, J. J.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Xu, X.

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Yang, G.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Yang, H.

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

Yang, J.

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

Yang, Z.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Yang, Z. F.

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

Ye, S.

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Yu, Y.

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

Zhang, C.

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

Zhang, G.

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

Zhang, X.

X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014).
[Crossref] [PubMed]

Zhang, X. G.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Zhang, Y.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Zhao, L. X.

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

Zhong, J.

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

Zhou, J.

J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014).
[Crossref]

Zhou, J. J.

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Zhou, L. Y.

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Zhu, Q. Q.

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Zych, A.

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

Acta Crystallogr. (1)

R. Shannon, “Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides,” Acta Crystallogr. 32(5), 751–767 (1976).
[Crossref]

Acta Crystallogr. C (1)

J. B. Kim, K. S. Lee, I. H. Suh, J. H. Lee, J. R. Pank, and Y. H. Shin, “Strontium Metaborate, SrB2O4,” Acta Crystallogr. C 52(3), 498–500 (1996).
[Crossref]

Appl. Phys. Lett. (2)

S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64(13), 1687–1689 (1994).
[Crossref]

T. Nishida, T. Ban, and N. Kobayashi, “High-color-rendering light sources consisting of a 350-nm ultraviolet light-emitting diode and three-basal-color phosphors,” Appl. Phys. Lett. 82(22), 3817–3819 (2003).
[Crossref]

Appl. Phys., A Mater. Sci. Process. (1)

P. Schlotter, R. Schmidt, and J. Schneider, “Luminescence conversion of blue light emitting diodes,” Appl. Phys., A Mater. Sci. Process. 64(4), 417–418 (1997).
[Crossref]

Ceram. Int. (2)

X. Z. Qin, X. G. Zhang, P. He, Q. Pang, L. Y. Zhou, and M. L. Gong, “Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor,” Ceram. Int. 41(4), 5554–5560 (2015).
[Crossref]

Q. Hu, L. Wang, Z. Huang, and Z. Fang, “Tunable single-phase white-light-emitting Ba2Mg(BO3)2:Ce3+, Na+, Tb3+, Eu2+ phosphor based on energy transfer,” Ceram. Int. 41(7), 8988–8995 (2015).
[Crossref]

Dalton Trans. (3)

Z. Tao, Y. Huang, and H. J. Seo, “Blue luminescence and structural properties of Ce3+-activated phosphosilicate apatite Sr5(PO4)2(SiO4),” Dalton Trans. 42(6), 2121–2129 (2013).
[Crossref] [PubMed]

Z. Xia and W. Wu, “Preparation and luminescence properties of Ce3+ and Ce3+/Tb3+-activated Y4Si2O7N2 phosphors,” Dalton Trans. 42(36), 12989–12997 (2013).
[Crossref] [PubMed]

X. Zhang and M. Gong, “Single-phased white-light-emitting NaCaBO3:Ce3+,Tb3+,Mn2+ phosphors for LED applications,” Dalton Trans. 43(6), 2465–2472 (2014).
[Crossref] [PubMed]

Inorg. Chem. (2)

J. Yang, C. Zhang, C. Li, Y. Yu, and J. Lin, “Energy transfer and tunable luminescence properties of Eu3+ in TbBO3 microspheres via a facile hydrothermal process,” Inorg. Chem. 47(16), 7262–7270 (2008).
[Crossref] [PubMed]

C. Liu, H. Liang, X. Kuang, J. Zhong, S. Sun, and Y. Tao, “Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation,” Inorg. Chem. 51(16), 8802–8809 (2012).
[Crossref] [PubMed]

J. Alloys Compd. (1)

B. V. Ratman, M. Jayasimhadri, G. B. Kumar, K. Jang, S. S. Kim, Y. I. Lee, J. M. Lim, D. S. Shin, and T. K. Song, “Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs,” J. Alloys Compd. 564, 100–104 (2013).
[Crossref]

J. Lumin. (1)

Z. F. Yang, Y. H. Hu, L. Chen, and X. J. Wang, “Color tuning of Ba2ZnSi2O7:Ce3+, Tb3+ phosphor via energy transfer,” J. Lumin. 153, 412–416 (2014).
[Crossref]

J. Mater. Chem. (3)

L. Wu, Y. Zhang, M. Y. Gui, P. Z. Lu, L. X. Zhao, S. Tian, Y. F. Kong, and J. J. Xu, “Luminescence and energy transfer of a color tunable phosphor:Dy 3+, Tm 3+, and Eu 3+-coactivated KSr4(BO3)3 for warm white UV LEDs,” J. Mater. Chem. 22(13), 6463–6470 (2012).
[Crossref]

H. Jing, C. Guo, G. Zhang, X. Su, Z. Yang, and J. H. Jeong, “Photoluminescent properties of Ce3+ in compounds Ba2Ln(BO3)2Cl (Ln= Gd and Y),” J. Mater. Chem. 22(27), 13612–13618 (2012).
[Crossref]

R. J. Xie, N. Hirosaki, N. Kimura, K. Sakuma, and M. Mitomo, “2-phosphor-converted white light-emitting diodes using oxynitride/nitride phosphors,” J. Mater. Chem. 90(19), 1101 (2007).

J. Mater. Chem. C Mater. Opt. Electron. Devices (1)

J. Zhou and Z. G. Xia, “Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+, Eu3+ phosphors,” J. Mater. Chem. C Mater. Opt. Electron. Devices 2(34), 6978–6984 (2014).
[Crossref]

J. Nanopart. Res. (1)

R. Marin, G. Sponchia, P. Riello, R. Sulcis, and F. Enrichi, “Photoluminescence properties of YAG:Ce3+, Pr3+ phosphors synthesized via the Pechini method for white LEDs,” J. Nanopart. Res. 14(6), 1–13 (2012).
[Crossref] [PubMed]

J. Phys. Chem. A (1)

J. M. Ogiegło, A. Zych, K. V. Ivanovskikh, T. Jüstel, C. R. Ronda, and A. Meijerink, “Luminescence and energy transfer in Lu3Al5O12 scintillators co-doped with Ce3+ and Tb3+.,” J. Phys. Chem. A 116(33), 8464–8474 (2012).
[Crossref] [PubMed]

J. Phys. Chem. C (1)

Z. G. Xia and R. S. Liu, “Tunable blue-green color emission and energy transfer of Ca2Al3O6F:Ce3+, Tb3+ phosphors for near-UV white LEDs,” J. Phys. Chem. C 116(29), 15604–15609 (2012).
[Crossref]

J. Solid State Chem. (2)

D. Wen, H. Yang, G. Yang, J. Shi, M. Wu, and Q. Su, “Structure and photoluminescence properties of Na2Y2B2 O7: Ce3+, Tb3+ phosphors for solid-state lighting application,” J. Solid State Chem. 213, 65–71 (2014).
[Crossref]

G. Blasse, “Energy transfer between inequivalent Eu2+ ions,” J. Solid State Chem. 62(2), 207–211 (1986).
[Crossref]

Mater. Res. Bull. (1)

W. W. Hu, Q. Q. Zhu, L. Y. Hao, X. Xu, and S. Agathopoulos, “Luminescence properties and energy transfer in AlN:Ce3+, Tb3+ phosphors,” Mater. Res. Bull. 51, 224–227 (2014).
[Crossref]

Mater. Sci. Semicond. Process. (1)

C. L. Wu, A. Luo, G. P. Du, X. M. Qin, and W. Z. Shi, “Synthesis and luminescent properties of nonaggregated YAG:Ce3+ phosphors via the molten salt synthesis method,” Mater. Sci. Semicond. Process. 16(3), 679–685 (2013).
[Crossref]

Nat. Mater. (1)

T. Hashimoto, F. Wu, J. S. Speck, and S. Nakamura, “A GaN bulk crystal with improved structural quality grown by the ammonothermal method,” Nat. Mater. 6(8), 568–571 (2007).
[Crossref] [PubMed]

Opt. Lett. (1)

Opt. Mater. (1)

J. J. Zhou, Y. Teng, S. Ye, X. F. Liu, and J. R. Qiu, “Broadband down-conversion spectral modification based on energy transfer,” Opt. Mater. 33(2), 153–158 (2010).
[Crossref]

Philips Res. Rep. (1)

G. Blasse, “Energy transfer in oxidic phosphors,” Philips Res. Rep. 24(2), 131–144 (1969).

Physica B (1)

Y. H. Jin, Y. H. Hu, L. Chen, X. J. Wang, Z. F. Mu, G. F. Ju, and Z. F. Yang, “A novel emitting color tunable phosphor Ba3Gd(PO4)3:Ce3+, Tb3+ based on energy transfer,” Physica B 436, 105–110 (2014).
[Crossref]

Rev. Sci. Instrum. (1)

S. Leyre, E. Coutino-Gonzalez, J. J. Joos, J. Ryckaert, Y. Meuret, D. Poelman, P. F. Smet, G. Durinck, J. Hofkens, G. Deconinck, and P. Hanselaer, “Absolute determination of photoluminescence quantum efficiency using an integrating sphere setup,” Rev. Sci. Instrum. 85(12), 123115 (2014).
[Crossref] [PubMed]

Science (1)

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[Crossref] [PubMed]

Other (1)

G. Blasse and B. Grabmarier, Luminescent Materials (Springer-Verlag, 1994).

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Figures (12)

Fig. 1
Fig. 1 (a) XRD patterns of samples SrB2O4:xCe3+, yTb3+, zNa+. (b) Crystal structure of SrB2O4 (along Z axis) and the coordination environment of Sr with O atoms (M+ = Li+, Na+, K+).
Fig. 2
Fig. 2 Diffuse reflection spectra of sample SrB2O4:xCe3+, yTb3+, zNa+.
Fig. 3
Fig. 3 The PLE and PL spectra of phosphor SrB2O4:0.02Ce3+. The dotted lines A and B are double-peak fitting of Ce3+ by Gauss fitting. The inset is photoluminescence intensities of SrB2O4:xCe3+ as a function of Ce3+ contents.
Fig. 4
Fig. 4 (a) The normalized emission bands of the SrB2O4:xCe3+ phosphors (λex = 319 nm). The inset is the maximum wavelength for each of the SrB2O4:xCe3+ phosphors (λex = 319 nm). (b) The emission bands of the SrB2O4:0.02Ce3+, 0.02M+ (M+ = Li+, Na+, K+) (λex = 319 nm).
Fig. 5
Fig. 5 The excitation and emission spectra of SrB2O4:0.02Ce3+ (a) and SrB2O4:0.03Tb3+ (b).
Fig. 6
Fig. 6 The PLE and PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+ (a) and the PLE spectrum of SrB2O4:0.03Tb3+ (b) (for comparison, the red dotted line is timed by 30).
Fig. 7
Fig. 7 The PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ and SrB2O4:0.02Ce3+, 0.03Tb3+ phosphors (λex = 319 nm). The inset is the double-peak fitting of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ (2.8-3.5 eV) by Gauss fitting.
Fig. 8
Fig. 8 (a) The emission spectra of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors (λex = 319 nm). (b) The normalized emission intensity of Ce3+ (5d-4f) and Tb3+ (5D47FJ) as a function of Tb3+ contents and the intensities of ηET as a function of Tb3+ contents.
Fig. 9
Fig. 9 Dependence of Iso /Is of Cn/3 on the exponent (a) n = 6, (b) n = 8 and (c) n = 10.
Fig. 10
Fig. 10 Photoluminescence decay curves of SrB2O4:0.02Ce3+, yTb3+, zNa+ phosphors.
Fig. 11
Fig. 11 CIE chromaticity coordinates of SrB2O4:0.02Ce3+, 0.02Na+ (A), SrB2O4:0.02Ce3+, 0.03Tb3+ (C), SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ (D) (λex = 319 nm) and the CIE chromaticity coordinates of SrB2O4:0.03Tb3+ (B) under (λex = 258 nm).
Fig. 12
Fig. 12 (a) The temperature-dependent PL spectra of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+ex = 319 nm). (b) The normalized emission bands of Ce3+ (5d-4f) as a function of temperature contents. (c) The intensity of the emission of Ce3+ and Tb3+ ion as a function of temperature contents. (d) The ln(I0/IT −1) vs. 1/kT activation energy graph for thermal quenching of SrB2O4:0.02Ce3+, 0.03Tb3+, 0.05Na+.

Tables (1)

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Table 1 The CIE Chromaticity Coordinates of SrB2O4:xCe3+, yTb3+, zNa+ under the excitation of 319 nm UV and SrB2O4:0.03Tb3+ excited at 258 nm.

Equations (7)

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η T = 1 I s / I s o
R C e T b 2 [ 3 V 4 π x c Z ] 1 3
I s o I s C n / 3
Q E = P c ( 1 A d i r ) P b L a A d i r
A d i r = 1 L c L b
I = I 0 exp ( t τ )
I T = I 0 / [ 1 + exp ( E a / k T ) ]

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