Tape-Cast YAG:Ce-Al2O3 Composite Phosphor Ceramics for Laser-Driven Lighting

YAG:Ce-Al 2 O 3 composite phosphor ceramics exhibit exceptional thermal and optical properties, demonstrating remarkable resistance to high-power laser excitation and highly promising for laser-driven solid-state lighting. However, due to limitations in understanding the effects of raw materials, fabricating densely structured and homogeneously distributed composite ceramics via tape casting remains a significant challenge. In this study, we investigated effects of particle size and content of raw powders on rheological properties of slurry, microstructure and optical properties of composite phosphor ceramics. The YAG:Ce-70 wt% Al 2 O 3 composite phosphor ceramic, prepared by using nano-sized Y 2 O 3 and Al 2 O 3 , showed fully densified and homogeneous microstructure and demonstrated optimal optical properties. Under excitation at a blue laser power density of 21.20   W·mm -2 , the YAG:Ce-70 wt% Al 2 O 3 ceramic with a thickness of 0.2   mm created white light with a luminous flux of 1496.05   lm and 141.14   lm·W -1 . This work paves an avenue to large-scale production of high-performance phosphor ceramics.