Green-emissive Ce:LuAlO-AlO nanoceramics elaborated glass crystallization for high-power laser lighting applications

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-05, Vol.12 (2), p.7188-7196
• Main Authors: Fu, Jie, Feng, Shaowei, Genevois, Cécile, Véron, Emmanuel, Yang, Yafeng, Wang, Hui, Ma, Zhibiao, Bai, Linghan, Xu, Wenlong, Fan, Ruyu, Wang, Chengzhi, Allix, Mathieu, Li, Jianqiang
• Format: Article
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d4tc00616j

Transparent Ce:Lu 3 Al 5 O 12 (Ce:LuAG) phosphor ceramics are regarded as the most promising green color conversion materials in the next-generation of laser diode (LD) lighting. However, the insufficient scattering of incident blue laser and poor heat quenching seriously prevent the application of transparent Ce:LuAG phosphor ceramics in high-quality LD-driven lighting, especially at high input power density. In view of this, a biphasic Ce:LuAG-Al 2 O 3 green phosphor ceramic is proposed in this study. Using an excessive Al 2 O 3 component design strategy, the Al 2 O 3 secondary phase is in situ generated in the resulting ceramic material via the full bulk glass crystallization method. The in situ generated Al 2 O 3 secondary phase can serve as a light scattering center and has good thermal conductivity. Therefore, the luminescence properties and thermal stability of transparent Ce:LuAG-Al 2 O 3 phosphor ceramics are greatly enhanced compared to Ce:LuAG. An ultrahigh luminous flux (LF) of 5124.7 lm and an excellent luminous density of 4235.5 lm mm −2 are achieved in LD-driven lighting under 450 nm high power density laser excitation (29.83 W mm −2 ), which has been almost the best performance of transparent Ce:LuAG ceramics in LD lighting to date. A maximum luminous efficiency of 247.9 lm W −1 (4.38 W mm −2 ) is also obtained. These results demonstrate that the transparent Ce:LuAG-Al 2 O 3 nanoceramics prepared in this work are promising green-emitting color converters to achieve high-brightness and excellent luminous density for high power LD lighting. The excessive Al 2 O 3 component design strategy could also further drive the development of garnet-based transparent ceramics in the field of high-power LD lighting. Ce:LuAG-Al 2 O 3 nanoceramics prepared through glass crystallization present an ultrahigh luminous flux (LF) of 5124.7 lm and an excellent luminous density of 4235.5 lm mm −2 in LD-driven lighting.