YAG:Ce-glass/porous stainless steel composite materials for laser illumination

Al 2 O 3 -based YAG:Ce PiG composite films have gained significant attention as optimal color converters for laser illumination due to their straightforward fabrication process and exceptional stability. However, the inherent limitations in the thermal conductivity of Al 2 O 3 result in a low pump utilization rate, making it challenging to achieve efficient white light output from PiG films. In this study, we introduce a novel laser illumination component composed of porous stainless steel (PSS) integrated with YAG:Ce/glass (PGiPSS), which has been sintered at 750 °C. The PSS demonstrates adequate thermal conductivity and the capacity to host a substantial number of luminescent particles within its pores, leading to enhanced quantum efficiency and reduced thermal quenching effects. Notably, when subjected to a 450 nm laser diode with a peak excitation power density of 24.10 W/mm 2 , the developed PGiPSS generated white light with a correlated color temperature (CCT) of 6693 K and an impressive luminous efficiency of 135.2 lm/W. These findings indicate that PGiPSS is a viable candidate for applications requiring high-power and high-brightness laser illumination.