Unique strategy for a highly efficient red phosphor-in-glass ceramic for laser-driven display

Abstract

Advanced laser phosphor display (ALPD) technology based on phosphor converters offers high brightness, a wide colour gamut and no speckle. However, the glass matrix’s relatively low thermal conductivity and red phosphor’s poor thermal stability present key challenges for developing high-efficiency red converters with remarkable luminescence saturation for next-generation ALPD technology. Herein, several novel phosphor-in-glass ceramics (PiGCs) were prepared using spark plasma sintering (SPS) with glass ceramic (GC) powder and CaAlSiN₃: Eu^2 + (CASN) red phosphor as raw materials. The satisfactory crystallinity of the GC powder and the low temperature of SPS enabled these PiGCs to exhibit excellent luminescence performance and tolerate elevated laser power. When fabricated into a phosphor wheel, the high-speed rotating device achieved a luminous flux of 427 lm, with the luminescence saturation threshold exceeding 13.48 W. These results verify that the CASN-PiGC red converter possesses considerable potential for use in high-power laser displays.