A novel PIGF system with high thermal conductivity and luminous efficiency based on TeO2 glass@t-SiO2 for laser lighting†

Significant challenges in developing color-converting materials with high thermal conductivity and luminous efficiency lie ahead for laser lighting. In this study, it is reported for the first time that tetragonal SiO₂ crystals prepared via high-temperature thermal treatment are skillfully combined with tellurite phosphor-in-glasses into composite materials. The establishment of an internal and external dual heat dissipation system allows the composite material to achieve effective thermal management and maintain stable luminescence. It's worth mentioning the enhancement of thermal stability and luminescence performance of the composite material, which result from the effect of t-SiO₂ as both heat dissipation factors and scattering centers. After optimizing the formulation and dimensions, the material achieves a bright and dazzling white light output of 1823 lm, with the maximum laser damage threshold increased to 16 W mm⁻². As a consequence, this phosphor-in-glass film based on TeO₂ glass@t-SiO₂ holds promising commercial prospects for applications in high-power white light laser illumination.