Chen Weibin, Wang Yuzhen, Liu Gaochao, Li Chaojie, Xia Zhiguo
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Centre of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong, 510641, China.
Adv Mater. 2024 Dec;36(52):e2413857. doi: 10.1002/adma.202413857. Epub 2024 Nov 3.
Ultrabright broadband near-infrared (NIR) phosphor-converted laser diode (pc-LD) as a light source is increasingly essential for improving the sensitivity and spatial resolution of intelligent NIR spectroscopy technologies. However, the performance of NIR pc-LD is greatly hindered by the low external quantum efficiency (EQE) and poor thermal resistance of phosphor materials. Herein, a highly stable phosphor-in-ceramic (PiC) film deposited on high thermal conductivity substrate, in which the NIR-emitting CaMgHfGeO:Cr phosphor is incorporated into a glass-crystallized CaGaGeO ceramic matrix, along with the formation of a new type PiC composite material with high efficiency, absorbance, and thermal conductivity, is designed and prepared. The obtained PiC exhibits an impressive EQE of 57.7%, high thermal conductivity of 17.1 W m K, and the PiC wheel demonstrates a broadband NIR emission exceeding 5 W when excited by a 450 nm laser. Finally, a groundbreaking electrically driven pc-LD device based on PiC achieves 1.6 W of NIR output, enabling multiple intelligent spectroscopy applications in archaeology and night vision imaging. This work paves the way for advancing broadband NIR light sources in a diverse range of photonic applications.
超亮宽带近红外（NIR）磷光转换激光二极管（pc-LD）作为一种光源，对于提高智能近红外光谱技术的灵敏度和空间分辨率越来越重要。然而，近红外pc-LD的性能受到磷光材料低外量子效率（EQE）和差的热阻的极大阻碍。在此，设计并制备了一种沉积在高导热率衬底上的高度稳定的陶瓷中磷光体（PiC）薄膜，其中发射近红外光的CaMgHfGeO:Cr磷光体被掺入玻璃结晶的CaGaGeO陶瓷基体中，同时形成了一种具有高效率、吸收率和热导率的新型PiC复合材料。所获得的PiC表现出令人印象深刻的57.7%的EQE、17.1 W m K的高导热率，并且PiC轮在450 nm激光激发下展示出超过5 W的宽带近红外发射。最后，基于PiC的开创性电驱动pc-LD器件实现了1.6 W的近红外输出，使得在考古学和夜视成像中能够进行多种智能光谱应用。这项工作为在各种光子应用中推进宽带近红外光源铺平了道路。
