Ce:(Lu,Sr)₃(Al,Si)₅O₁₂ transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

As a new generation solid state lighting source, high-power phosphor-converted white light-emitting diode or laser diode (LED/LD) lighting has drawn much attention. However, under the excitation of a high power density laser, the high temperature induced performance degradation of thermal stability and color quality for green conversion materials becomes the major challenge. In this work, heavy atom Sr2+ and highly charged Si4+ were used to substitute Lu3+ and Al3+, displaying the effect of lattice relaxation depression. The remarkable 98% emission intensity of TCs was retained at 150 degrees C, and the abnormal thermal quenching phenomenon was discovered. The optimized TC-based LD devices exhibited an ultra-high luminance saturation threshold of 65 W mm(-2), and the ceramic surface temperature was dramatically reduced to 114.4 degrees C at similar to 50 W mm(-2). More importantly, the luminous efficiency of radiation (LER) was also maintained to be as high as 261.98 lm W-1. Ce:LSASG TCs showed excellent thermal quenching behavior and the highest saturation threshold. This result provides a new path to design innovative photoelectric materials with favorable thermal stability for high power devices.