@article{Hu2025, 
author = {Huiying Hu and Bingguo Xue and Shaohong Liu and Limin Zhou and Hao Cui and Manmen Liu and Haigang Dong and Li Chen and Ming Wen and Feng Liu and Song Li and Liang Zuo},
title = {Lowering operating temperatures in high-power laser-excited LuAG:Ce films by improving crystallinity and increasing Ce3+ content},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {4},
pages = {9221061},
keywords = {white lighting, color converter, operating temperature, LuAG:Ce film, thermal stability},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221061},
doi = {10.26599/JAC.2025.9221061},
abstract = {High operating temperatures generally degrade the luminous performance of color converters used in high-power, laser-driven white lighting systems. This study demonstrated that the operating temperature of LuAG:Ce films can be significantly reduced, particularly under high-power laser excitation near the saturation threshold. This improvement was achieved by enhancing the crystallinity and increasing the Ce3+ content in LuAG:Ce films. LuAG:Ce films, approximately 22.17 μm in thickness, were deposited on sapphire substrates via spray pyrolysis techniques. The crystallinity was controlled by the annealing temperature, while the Ce3+ content was regulated by the annealing atmosphere. Compared with those with a crystallinity of 75.5%, the air-annealed films with a crystallinity of 87.4% exhibited a remarkable 95.6 °C decrease in operating temperature under 18 W/mm2 blue laser excitation. Additionally, the incorporation of a higher Ce3+ content through CO annealing led to a further reduction in the operating temperature. By lowering the operating temperature, LuAG:Ce films on sapphire substrates exhibit enhanced luminous performance and thermal stability under prolonged high-power laser excitation, which could inspire the design and development of advanced color converters for laser lighting applications.}
}