激光照明用青色荧光透明陶瓷的制备与光谱调控研究

荧光透明陶瓷具有耐激光辐照、高热导率、高光效等优势，是高功率激光照明光源中不可缺少的荧光转换材料。但由于国内外缺少青色荧光透明陶瓷，导致激光照明光源光谱在490nm附近存在“青光凹陷”，显色指数低（~60），极大限制了激光照明的应用。因此，亟待开发青色荧光透明陶瓷。本项目在前期自主研发的Lu2SrAl4SiO12:Ce3+高效青绿色荧光粉的基础上，提出采用大半径Ga3+取代Al3+策略，通过减弱晶体场强度，减小Ce3+ 5d1能级劈裂，实现发光谱带的蓝移和青光发射。系统研究材料的发光性质与Ga3+含量的依赖关系，阐明光谱调控机理，优化材料组分；然后开展青色荧光透明陶瓷的烧结制度研究，揭示陶瓷的致密化机制，掌握陶瓷的制备技术，制备出高效青色荧光透明陶瓷，获得无“青光凹陷”的高显色激光照明光源。本项目将为新体系荧光透明陶瓷的开发提供技术支持，促进荧光透明陶瓷在激光照明领域的广泛应用。

Transparent phosphor ceramics exhibit many advantages such as high thermal conductivity, high luminous efficiency and excellent resistance against laser irradiation, which enable them to be indispensable phosphor conversions for high-power white laser lighting. However, the color rendering index of laser lighting is low (~60) due to the deficiency of cyan component, called “cyan gap” at about 490 nm, which severely hindering their applications in products requiring high luminous and high brightness. Hence, it is urgently demand to develop cyan transparent phosphor ceramics. Based on the self-developed high-efficiency Lu2SrAl4SiO12:Ce3+ cyan-green phosphors (514 nm), this project proposes the idea of substituting the Al3+ cations with larger radius Ga3+, which would reduce the crystal field of Ce3+ and result in the blue-shift of the spectral. Phosphors with cyan emission will be developed and the mechanism of regulation spectrum involved will be studied. The dependence of the luminescence properties with Ga3+ content will also be investigated to optimize the composition of phosphor materials. And then we will develop the cyan transparent phosphor ceramics and study the predominant mechanisms for densification. Finally, high-efficiency cyan transparent phosphor ceramics will be prepared, which would enable us to get white laser light with high color rendering. This project can not only provides technical support for the exploitation and spectrum regulation of new transparent phosphor ceramics, but also can promote the application of transparent ceramic phosphors in white laser lighting.