稀土掺杂Ba9(Y,Lu)2Si6O24晶体结构与发光特性研究

白光LED被认为是新一代固态照明的首选光源。在紫外芯片上涂覆发射蓝、绿、红三种颜色的单一荧光粉，可以解决白光LED色彩漂移的问题，且白光具有高的显色指数和理想色温。但这种荧光粉的红光成分通常不足，导致荧光粉整体的发光效率较低，进而影响白光的效率。本项目拟在Ba9(Y,Lu)2Si6O24:Ce3+/Eu2+蓝绿荧光粉的基础上，共掺杂Mn2+/Pr3+橙红发光中心，利用Ce3+/Eu2+向Mn2+/Pr3+的能量传递，获得红光成分充足的全光谱发射，实现光谱分布的调控。通过研究能量传递和发光动力学过程，总结光谱调控机理，优化光谱调控方案及材料制备工艺，为研制具有自主知识产权的高效荧光材料提供物理依据。

White LED is regarded as a new lighting source for the next generation. UV LED chips combined with phosphors that containing blue, green, and red emissions exhibit ideal white light with high color rendering and low color temperature. However, the efficiency of these phosphors is too low. Basing on the high efficient blue-green phosphor Ba9(Y,Lu)2Si6O24: Ce3+/Eu2+, we propose codoping the orange-red emission centers of Mn2+ and Pr3+ to realize the full color emission and the controllable of the emission spectra through the energy transfers from Ce3+/Eu2+ to Mn2+/Pr3+. On the studies of the energy transfers dynamical processes, we will reveal the dependence of the luminescence spectral distribution on activator concentrations and optimize the emission spectra for the application of white LEDs. The present project will provide a strong physical basis for achieving our self-owned novel luminescent materials with high efficiency.