2025/03/11 by Huiying Hu, Bingguo Xue, Shaohong Liu +9 · 1 voice
Engineering · Materials Science · #Solid State Laser Technologies #Laser-induced spectroscopy and plasma #Luminescence Properties of Advanced Materials
paper · pdf · doi:10.26599/jac.2025.9221061
openalex created_date 2025/03/11 · openalex publication_date 2025/03/11 · openalex updated_date 2026/07/31
High operating temperatures generally degrade the luminous performance of color converters used in high-power, laser-driven white lighting systems. This study demonstrates 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 Ce<sup>3+</sup> 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 Ce<sup>3+</sup> content was regulated by the annealing atmosphere. Air-annealed films with a crystallinity of 87.4% exhibited a remarkable 95.6 °C decrease in operating temperature compared to those with a crystallinity of 75.5% under 18 W/mm<sup>2</sup> blue laser excitation. Additionally, the incorporation of a higher Ce<sup>3+</sup> content through CO-annealing led to a further reduction in 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.