Red-Emitting Cordierite Ceramic Enabling General Healthy Warm White Laser Lighting

Laser-driven phosphor-converted white-laser diodes are supposed to be next-generation high-brightness lighting sources for their unparalleled photoelectric efficiency and light quality, yet a significant obstacle hitherto has resided in the shortage and serious laser-induced luminescence saturation of red emitters. Here, a hot-pressing synthesis route to obtain high-performance red-emitting cordierite (Mg₂Al₄Si₅O₁₈:Eu²⁺) ceramic is developed, which enables the in situ formation of bulk specimens with high crystallinity (>90%) from the counterpart glass powders. A preeminent saturation threshold of 21 W mm⁻² is realized in a red-emitting Mg₂Al₄Si₅O₁₈:Eu²⁺ ceramic film converter. More importantly, the luminous exitance reaches 209 lm mm⁻², which is 5 times that of commercial red phosphor-converted-LED, indicating breakthrough progress in the comprehensive light-emitting performance of red converters. This work innovates the solid-state synthesis of laser bulk converters from glass to meet the demanding requirements of advanced warm white laser lighting.