A novel sapphire@PiGF@sapphire color converter with high luminescence saturation threshold for laser lighting
Next-generation high-brightness laser lighting confronts a key challenge in preparing static color converting materials with remarkable luminescence saturation. Herein, a novel architecture of transmissive Y3Al5O12: Ce3+ (YAG) phosphor-in-glass film (PiGF) with double-sided sapphires, i.e., a sandwich structured sapphire@PiGF@sapphire (S@PiGF@S) composite, was designed and fabricated by a thermocompression sintering technology. This kind of material can tolerate high laser power density (LPD) for the efficient double-sided thermal channels and the high-energy laser spot away from PiGF emitting layer. As a consequence, the optimized S@PiGF@S color converter yields white light with a high luminous flux (LF) of 7602 lm at a record luminescence saturation threshold of 46.47 W·mm-2 benefiting from its low working temperature of merely 284℃, which is 6.3 times that of traditional PiGF@sapphire color converter (1205 lm@10.89 W·mm-2). These findings verify that the developed S@PiGF@S color converter enables preferably optical-thermal performances for promising applications in high-brightness laser lighting.