For high-power laser lighting: Transparent YAG: Ce3+ phosphor-in-glass with high performance fabricated by low-temperature sintering

High-power lighting has focused on critical challenges in developing light-convert materials with excellent optical performance and luminous efficiency. Phosphor-in-glass (Pig) is composed of phosphor and glass matrix, which maintains the luminous property of the phosphor while retaining the excellent characteristics of the glass matrix, including thermal stability and thermal conductivity. In this work, a facile low-temperature co-sintering process is utilized to fabricate the light-convert Y 3 Al 5 O 12 :Ce 3+ Pig (YAG: Ce-Pig) using borosilicate glass matrix of xSiO 2 -yB 2 O 3 -zNa 2 O-aZnO-bCaO (mol%) and aluminate Y 3 Al 5 O 12 :Ce 3+ yellow phosphors. The YAG: Ce-Pig was produced by cold isostatic pressing to obtain high-quality and high-density. As a result, the YAG: Ce-Pig based LED lighting devices exhibited superior optical performance with the luminous efficacy (LE) reaching 154.88 lm/W. By further encapsulating YAG: Ce-Pig in the laser lighting system, the luminous efficacy can reach 226.03 lm/W. In addition, a reflective laser illumination optical guide was designed and constructed for laser illumination testing, in which a heat dissipation substrate was added to improve the thermal conductivity during testing. The results demonstrated that the YAG: Ce-Pig preserved excellent laser illumination performance under 4.56 W/mm 2 laser power density with 873.47 lm luminous flux (LF). The material also has excellent stability and tunability in terms of color rendering index and color temperature within the range of tunable laser power. In conclusion, the YAG: Ce-Pig in this work is produced by the simple and fast low-temperature sintering process with the advantages of low cost, easy fabrication, and controllable chromaticity. As a class of excellent light-convert materials, it can effectively convert high-energy blue light and realize high-power illumination. It also provides excellent optical performance under laser lighting which is valuable for commercial applications.