Gd3Al3Ga2O12:Ce, Mg2+ Transparent Ceramic Phosphors for High-Power White LEDs/LDs

Gd3Al3Ga2O12:1.5%Ce, xMg(2+) (GAGG:1.5%Ce, xMg(2+)) transparent ceramic phosphors (TCPs) were prepared via a two-step sintering method. The effects of MgO on microstructures and luminescent properties of GAGG:Ce TCPs are investigated for the first time. For the optimized Mg2+ of x = 0.5%, the in-line transmittance of the obtained TCP reaches 78.6%. Performances of the titled TCPs in high-power light-emitting diodes (LEDs) and laser diodes (LDs) lighting are illustrated. The optimized TCP shows the luminous efficacy of 84.0 lm W-1 in LD lighting. This work provides a strategy to modify TCPs for the next-generation LD lighting.