Fabrication of LuAG:Ce–Al2O3 eutectics via laser-heated pedestal growth technique for high-power laser-driven lighting

Abstract

Thermally robust and highly stable bulk luminescent materials are essential for advancing high-power laser-driven lighting. In this study, we report a yellow–green LuAG:Ce–Al₂O₃ eutectic, synthesized using the laser-heated pedestal growth (LHPG) technique. The emission intensity of the eutectics reaches a maximum at an Al₂O₃ content of 20% due to the enhanced light scattering. Additionally, owing to the high thermal conductivity of Al₂O₃, the prepared LuAG:Ce–Al₂O₃ eutectic exhibits low thermal quenching, with only a 5% loss in luminescence observed at 150°C, along with a high luminance saturation threshold of approximately 15.8 W·mm⁻². When irradiated under blue laser excitation at 7.9 W, the prepared LuAG:Ce–Al₂O₃ eutectic demonstrates a luminous flux of 1917 lm and a luminous efficacy of 242.4 lm·W⁻¹. These results highlight that the potential of LuAG:Ce–Al₂O₃ eutectics as luminescent materials for high-power laser-driven lighting applications.