Fluorescence characterization of heavily Eu<sup>3+</sup>-doped lanthanum gallate glass spheres with high quenching concentration

Kohei Yoshimoto; Yoshinobu Ezura; Motoi Ueda; Atsunobu Masuno; Hiroyuki Inoue; Masafumi Mizuguchi

doi:10.1364/OL.44.000875

Optics Letters
Vol. 44,
Issue 4,
pp. 875-878
(2019)
•https://doi.org/10.1364/OL.44.000875

Fluorescence characterization of heavily Eu³⁺-doped lanthanum gallate glass spheres with high quenching concentration

Kohei Yoshimoto, Yoshinobu Ezura, Motoi Ueda, Atsunobu Masuno, Hiroyuki Inoue, and Masafumi Mizuguchi

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Kohei Yoshimoto, Yoshinobu Ezura, Motoi Ueda, Atsunobu Masuno, Hiroyuki Inoue, and Masafumi Mizuguchi, "Fluorescence characterization of heavily Eu³⁺-doped lanthanum gallate glass spheres with high quenching concentration," Opt. Lett. 44, 875-878 (2019)

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- Materials and Metamaterials
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About this Article
History
- Original Manuscript: December 11, 2018
- Revised Manuscript: January 11, 2019
- Manuscript Accepted: January 11, 2019
- Published: February 7, 2019

Abstract

Highly ${Eu}_{2} O_{3}$ -doped (up to 30 mol%) La₂O₃–Ga₂O₃ glasses were synthesized by an aerodynamic levitation technique. The red emission associated with ${}^{5}{D_{0}}$ level of ${Eu}^{3 +}$ was most intense at 20 mol% ${Eu}_{2} O_{3}$ , indicating a small effect of concentration quenching even at high Eu concentration. The fluorescence decay curves indicated that the dominant transition mechanism at high Eu concentration was fast energy migration among the ${Eu}^{3 +}$ ions, which averaged the environment of the Eu, yielding a nearly single-exponential decay of ${}^{5}{D_{0}} \to {}^{7}{F_{2}}$ emission. Lifetime of the ${}^{5}{D_{0}}$ level gradually decreased with ${Eu}_{2} O_{3}$ over the 5–25 mol% and rapidly decreased at 30 mol%, very consistent with the observed emission spectra.

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	T_g (°C)	T_p (°C)	$Δ T (° C)$	ρ $(g \cdot {cm}^{- 3})$	V_m $({cm}^{3} \cdot {mol}^{- 1})$	$N_{Eu} ({cm}^{- 3})$
0.5ELG	749	833	84	5.97	21.5	$0.14 \times 10^{21}$
5ELG	752	841	89	6.03	21.4	$1.4 \times 10^{21}$
10ELG	754	847	93	6.10	21.2	$2.8 \times 10^{21}$
20ELG	759	866	105	6.25	20.9	$5.8 \times 10^{21}$
25ELG	762	875	113	6.39	20.6	$7.3 \times 10^{21}$
30ELG	765	884	119	6.49	20.4	$8.9 \times 10^{21}$

	Ce	Pr	Nd	Sm	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Cr	Mn	Fe	Ni	Cu	Total
0.5ELG	9.2	$< 0.1$	$< 0.1$	$< 0.1$	7.3	6.8	$< 0.1$	$< 0.1$	0.2	0.2	0.7	$< 0.1$	0.9	0.2	4.4	$< 0.1$	0.3	$< 30.9$
5ELG	8.6	$< 0.1$	$< 0.1$	$< 0.1$	4.1	0.6	$< 0.1$	$< 0.1$	0.1	0.9	0.3	$< 0.1$	1.1	$< 0.1$	1.5	$< 0.1$	0.5	$< 18.5$
10ELG	7.9	$< 0.1$	$< 0.1$	$< 0.1$	1.7	$< 0.1$	$< 0.1$	$< 0.1$	0.2	0.5	0.4	$< 0.1$	0.7	$< 0.1$	1.5	$< 0.1$	0.8	$< 14.6$
20ELG	5.4	$< 0.1$	$< 0.1$	0.2	0.6	6.9	$< 0.1$	$< 0.1$	$< 0.1$	0.4	0.4	$< 0.1$	$< 0.5$	$< 0.1$	7.2	$< 0.1$	1.1	$< 23.5$
25ELG	3.8	$< 0.1$	$< 0.1$	0.2	0.6	1.0	$< 0.1$	$< 0.1$	$< 0.1$	0.4	0.4	$< 0.1$	$< 0.5$	$< 0.1$	0.4	$< 0.1$	1.4	$< 9.5$
30ELG	3.3	$< 0.1$	$< 0.1$	0.2	0.5	1.0	$< 0.1$	$< 0.1$	$< 0.1$	0.5	0.3	$< 0.1$	$< 0.5$	$< 0.1$	1.8	$< 0.1$	2.8	$< 11.7$

	T_g (°C)	T_p (°C)	$Δ T (° C)$	ρ $(g \cdot {cm}^{- 3})$	V_m $({cm}^{3} \cdot {mol}^{- 1})$	$N_{Eu} ({cm}^{- 3})$
0.5ELG	749	833	84	5.97	21.5	$0.14 \times 10^{21}$
5ELG	752	841	89	6.03	21.4	$1.4 \times 10^{21}$
10ELG	754	847	93	6.10	21.2	$2.8 \times 10^{21}$
20ELG	759	866	105	6.25	20.9	$5.8 \times 10^{21}$
25ELG	762	875	113	6.39	20.6	$7.3 \times 10^{21}$
30ELG	765	884	119	6.49	20.4	$8.9 \times 10^{21}$

	Ce	Pr	Nd	Sm	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Cr	Mn	Fe	Ni	Cu	Total
0.5ELG	9.2	$< 0.1$	$< 0.1$	$< 0.1$	7.3	6.8	$< 0.1$	$< 0.1$	0.2	0.2	0.7	$< 0.1$	0.9	0.2	4.4	$< 0.1$	0.3	$< 30.9$
5ELG	8.6	$< 0.1$	$< 0.1$	$< 0.1$	4.1	0.6	$< 0.1$	$< 0.1$	0.1	0.9	0.3	$< 0.1$	1.1	$< 0.1$	1.5	$< 0.1$	0.5	$< 18.5$
10ELG	7.9	$< 0.1$	$< 0.1$	$< 0.1$	1.7	$< 0.1$	$< 0.1$	$< 0.1$	0.2	0.5	0.4	$< 0.1$	0.7	$< 0.1$	1.5	$< 0.1$	0.8	$< 14.6$
20ELG	5.4	$< 0.1$	$< 0.1$	0.2	0.6	6.9	$< 0.1$	$< 0.1$	$< 0.1$	0.4	0.4	$< 0.1$	$< 0.5$	$< 0.1$	7.2	$< 0.1$	1.1	$< 23.5$
25ELG	3.8	$< 0.1$	$< 0.1$	0.2	0.6	1.0	$< 0.1$	$< 0.1$	$< 0.1$	0.4	0.4	$< 0.1$	$< 0.5$	$< 0.1$	0.4	$< 0.1$	1.4	$< 9.5$
30ELG	3.3	$< 0.1$	$< 0.1$	0.2	0.5	1.0	$< 0.1$	$< 0.1$	$< 0.1$	0.5	0.3	$< 0.1$	$< 0.5$	$< 0.1$	1.8	$< 0.1$	2.8	$< 11.7$

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Optics Letters