High-performance and heat-resistant Ce:YAG phosphor in glass for laser lighting

Abstract

In recent years, the success of laser lighting and display technology depends on the comprehensive properties of light conversion materials such as thermal stability and luminous efficiency. Therefore, fluorescent glass has become the main research object due to its outstanding comprehensive properties such as simple preparation and high quantum efficiency. In this study, a kind of Na2O-K2O-SrO-MgO-CaO-Al2O3-B2O3-SiO2 glass matrix was carefully designed to reduce the damage of Y3Al5O12:Ce3+(Ce:YAG) phosphor in the compounding process. This glass component not only has a low melting point, but also has a high thermal conductivity. More importantly, Ce:YAG phosphor-in-glass (Ce:YAG-PiG) prepared by mixing the optimized glass powder with Ce:YAG phosphors has high thermal conductivity and luminescent properties. Under the excitation of 460 nm blue light, the quantum efficiency of Ce:YAG-PiG can reach 84.8%, which is 91.8% of that of the phosphors (92.4%). When the temperature is below 225 ℃, the thermal conductivity of the sample can be kept above 2.0 Wm−1K−1. Particularly, without any heat dissipation measures, the sample can withstand 3.15 W/mm2 blue laser radiation, and the luminous flux (LF) is 517.83 lm. The results show that this Ce:YAG-PiG composite material can be used for ultra-high brightness laser illumination, which will have a good application prospect.