High-thermal-conductivity YAGG:Ce color converters on AlN substrate enabling high power and superior luminance in static and dynamic reflective laser illumination

Phosphor-in-glass (PiG) films have emerged as the preferred conversion materials for high-brightness laser-driven lighting due to their excellent thermal conductivity and superior optical performance. Screen printing technology was employed to investigate the correlation between the reflective layer thickness and light conversion efficiency. A multilayer-structured Y 3 Al 3.5 Ga 1.5 O 12 :Ce 3+ (YAGG:Ce)-PiG-TiO 2 -aluminium nitride (AlN) film (YG-TAF) converter was constructed by efficiently coupling the optimal thickness of the reflective layer with the PiG layer and the AlN substrate. Notably, the YG-TAF shows an impressive thermal conductivity of 22.6 W/(m·K) and a maximum anti-laser power of 15.84 W, demonstrating superb thermal regulation capability. This anti-laser power of 15.84 W represents a breakthrough in current static laser performance research. Impressively, an YG-TAF phosphor color wheel was designed, which achieves an ultra-high-brightness 4375 lm of green light under 450 nm, 88 W laser power excitation, close to that of commercial phosphor silicone color wheels. This advancement not only demonstrates the excellent performance of YG-TAF in high-brightness dynamic reflective laser applications but also indicates its strong feasibility for practical implementation. Furthermore, the developed YAGG:Ce-Y 1.31 Ce 0.09 Gd 1.6 Al 5 O 12 -TAF spliced phosphor color wheel successfully mitigates the influence of photon reabsorption and achieves a color rendering index of 80.5, showing great potential for advancement of the field of reflective white light laser illumination.