Yao Qi, Hu Pan, Sun Peng, Liu Min, Dong Rui, Chao Kefu, Liu Yongfu, Jiang Jun, Jiang Haochuan
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, P. R. China.
Adv Mater. 2020 May;32(19):e1907888. doi: 10.1002/adma.201907888. Epub 2020 Mar 29.
Y Al O :Ce (YAG:Ce ) transparent ceramic phosphors (TCPs) are regarded as the most promising luminescent converter for laser-driven (LD) lighting. High-quality YAG:Ce TCPs are still urgent for high efficiency LD lighting devices. YAG:Ce TCPs in a vacuum ambience by using nano-sized raw materials are prepared. Controlling defects by adding nano-sized MgO and SiO simultaneously enables a high transmittance nearly 80%. After annealing in air furthermore, the luminous efficiency is enhanced greatly from 106 to 223 lm W , which is the best result reported now for LD lighting. These results demonstrate that the optimizing YAG:Ce TCPs in a fitting strategy will brighten once again in the next-generation LD lighting. Based on scanning electron microscopy (SEM) coupled with a cathodoluminescence system, defects and Ce distributions in grains are identified directly for the first time.
铈（YAG:Ce）透明陶瓷荧光粉（TCPs）被认为是激光驱动（LD）照明中最有前途的发光转换器。高质量的YAG:Ce TCPs对于高效LD照明设备仍然十分迫切。通过使用纳米级原料在真空环境中制备YAG:Ce TCPs。同时添加纳米级MgO和SiO来控制缺陷，可实现近80%的高透过率。此外，在空气中退火后，发光效率从106大幅提高到223 lm/W，这是目前LD照明报道的最佳结果。这些结果表明，采用合适策略优化的YAG:Ce TCPs将在下一代LD照明中再次大放异彩。基于扫描电子显微镜（SEM）与阴极发光系统相结合，首次直接识别了晶粒中的缺陷和Ce分布。
