@article{Xue2026, 
author = {Bingguo Xue and Shaohong Liu and Huiying Hu and Limin Zhou and Hao Cui and Hongying Pei and Wenyan Zhou and Manmen Liu and Haigang Dong and Ming Wen and Li Chen and Wei Wang and Song Li and Liang Zuo},
title = {Origins of heat and luminous saturation in LuAG:Ce thin films for high-power laser lighting},
year = {2026},
journal = {Journal of Advanced Ceramics},
volume = {15},
number = {2},
pages = {9221238},
keywords = {laser-driven lighting, Lu3Al5O12 (LuAG:Ce) thin film, spray pyrolysis, heat generation, luminous saturation},
url = {https://www.sciopen.com/article/10.26599/JAC.2026.9221238},
doi = {10.26599/JAC.2026.9221238},
abstract = {The performance of high-power laser-driven lighting systems is fundamentally limited by an insufficient understanding of the mechanisms governing heat generation and luminous saturation in color-converting materials. In this study, Ce-doped Lu3Al5O12 (LuAG:Ce) thin films synthesized through spray pyrolysis across a doping range of 0.1–4.0 mol% are systematically investigated to elucidate these effects. Heat generation, resulting from the Stokes shift, is found to scale with both Ce concentration and excitation power density, emerging as a critical factor that constrains luminescence output. At an optimized doping level of 2.5 mol% Ce, the films achieve a luminous flux of 1618.3 lm and exhibit a saturation threshold of 28 W·mm−2 under ambient conditions. Incorporation of water cooling reduces the local laser spot temperature by approximately 42.3 °C at the same excitation intensity, effectively raising the saturation threshold to 32 W·mm−2 and increasing luminous flux to 1938.6 lm, representing a 19.8% enhancement. These results demonstrate that nonradiative transitions, arising from thermal quenching, lead to luminous saturation. Collectively, this study clarifies the origins of heat generation and luminous saturation in LuAG:Ce films under high-power laser excitation and underscores the critical roles of Ce doping optimization and heat dissipation in enhancing solid-state lighting performance.}
}