Abstract

In this work, we reported on high-brightness ${\mathrm{Eu}}^{3+}$-activated ${\mathrm{Ca}}_3\mathrm{Lu}{(\mathrm{AlO})}_3{({\mathrm{BO}}_3)}_4$ (CLAB) red-emitting phosphors. Under 397 nm excitation, the $\mathrm{CLAB}\text{:}{\mathrm{Eu}}^{3+}$ phosphors showed intense red emissions at around 621 nm with CIE coordinates of (0.657, 0.343). The optimal doping concentration of ${\mathrm{Eu}}^{3+}$ ions was found to be 30 mol. %, and the $\mathrm{CLAB}\text{:}0.3{\mathrm{Eu}}^{3+}$ sample possessed high-color purity of 93% and ultra-high internal quantum efficiency as great as 98.5%. Importantly, the $\mathrm{CLAB}\text{:}0.3{\mathrm{Eu}}^{3+}$ also had good thermal stability. Finally, a white-light-emitting diode (WLED) lamp with good color-rendering index was fabricated by using a 365 nm ultraviolet chip and the phosphor blends of $\mathrm{CLAB}\text{:}0.3{\mathrm{Eu}}^{3+}$ red-emitting phosphors, ${(\mathrm{Ba},\mathrm{Sr})}_2{\mathrm{SiO}}_4:{\mathrm{Eu}}^{2+}$ green-emitting phosphors, and ${\mathrm{BaMgAl}}_{10}{\mathrm{O}}_7:{\mathrm{Eu}}^{2+}$ blue-emitting phosphors.

© 2018 Optical Society of America

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