Unique Multilayer Gradient Design of Al<sub>2</sub>O<sub>3</sub> Doping Phosphor‐In‐Glass Film Enabling High‐Luminance Laser Lighting
Zhencheng Li, Jiuzhou Zhao, Yongjie Ding, Hongjin Zhang, Zhenyu Chen, Zhenzi Wu, Yufan Wei, Feng Wu, Changqing Chen, Yang Peng, Jiangnan Dai
Abstract
Abstract Next‐generation high‐luminance laser lighting faces a crucial challenge in developing a transmissive color converter with efficient heat dissipation and phosphor conversion. Herein, a unique architecture of Al 2 O 3 particles gradient doping phosphor‐in‐glass film (PiGF) coated on a transparent sapphire (AGD‐PiGF@S) is designed and prepared by a simple multilayer printing and low‐temperature sintering strategy. By optimizing the multilayer gradient doping structure, the 9‐0%AGD‐PiGF@S converter enables a high‐luminance white light with a high luminous flux (LF) of 2996 lm under a maximum laser power density saturation threshold (LPD‐ST) of 19 W mm −2 , which is 2.63 times of the traditional PiGF@S converter with a LF of 1139 lm@11 W mm −2 . The working temperature of this AGD‐PiGF@S converter is decreased by 35.8°C@11 W mm −2 (≈23.82%). Compared with the Al 2 O 3 uniform doping PiGF@S (4.5%AUD‐PiGF@S) converter, the maximum LF and luminous efficiency (LE) of AGD‐PiGF@S are increased by 58.18% and 33.20%, respectively. The findings will provide a new idea for realizing the preferably color converter in high‐luminance laser lighting and display.