Pore-coexisting BaAl 2 O 4 –LuAG:Ce composite phosphor ceramics for solid-state lighting

Le résumé fourni par la source

The coexistence of pores in composite phosphor ceramics (CPCs) for solid-sate lighting is not necessarily a disadvantage, and it may be more conducive to enhancing luminous efficiency. In this work, x wt.%BaAl2O4-LuAG:Ce CPCs (x=1, 3, 5, 10) were fabricated by solid-state reaction, which are pore-coexistence. BaAl2O4 can not only function as a sintering aid but also form secondary phases serving as scattering centers. The 3 wt.% BaAl2O4-LuAG:Ce exhibits an intriguing microstructure, where large and small grains of LuAG:Ce coexist alongside pores and the secondary phases, demonstrating better luminescent properties. Under 450 nm 0.92 W laser excitation, the 3 wt.%BaAl2O4-LuAG:Ce exhibits the optimum luminous efficiency of 237 lm/W and a luminous flux of 218 lm. As the laser power reaches 4.3 W, the 3 wt.% BaAl2O4-LuAG:Ce exhibits an optimal luminous flux of 1015 lm, which shows the prospect of being applied to solid-state lighting.

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