Patterned phosphor-in-glass films with efficient thermal management for high-power laser projection displays

Recently, high-performance color converters excitable by blue laser diode (LD) have sprung up for projection displays. However, the thermal accumulation effect of the color converters is a non-negligible problem under high-power LD irradiation. Herein, we developed novel opto-functional composites (patterned CaAlSiN₃:Eu²⁺ phosphor-in-glass film–Y₃Al₅O₁₂:Ce³⁺ phosphor-in-glass film@Al₂O₃ plate with aluminum "heat sink" ) via a thermal management methodology of combining "phosphor wheel" and "heat sink" for a lighting source of highpower laser projection displays. This new composite design makes it effective to transport generated thermal phonons away to reduce the thermal ionization process, and to yield stable and high-quality white light with brightness of 4510 lm@43 W, luminous efficacy of 105 lm/W, correlated color temperature of 3541 K, and color rendering index of 80.0. Furthermore, the phosphor-in-glass film-converted laser projection system was also successfully designed, showing a more vivid color effect compared to a traditional LED-based projector. This work emphasizes the importance of the thermal management upon high-power laser irradiation, and hopefully facilitates the development of a new LD-driven lighting source for high-power laser projection displays.