采用高温真空烧结技术制备了0.5% Ce∶Y3Al5O12(简称Ce∶YAG)透明荧光陶瓷,在透射模式下分别采用大功率蓝光发光二极管(LED)芯片(3.2 V×0.3 A)激发和LD蓝光光源(0.8 W,1.6 W)激发,系统研究了陶瓷厚度(0.3~2.3 mm)和表面粗糙度(322.86 nm,9.79 nm)等对照明原型器件的色温、显色指数和光电转换效率等发光性能的影响。结果表明,陶瓷表面有一定粗糙度可使原型器件的发光性能整体提高,其中用粗糙度为322.86 nm的 Ce∶YAG透明陶瓷组装的原型器件分别获得了93.6 lm/W(蓝光LED激发)和178.5 lm/W(蓝光LD激发)的高光电转换效率。研究表明,通过调节Ce∶YAG透明陶瓷的厚度和表面状态,可有效提升高功率密度固态照明器件的发光性能。

Ce∶Y3Al5O12(Ce∶YAG) transparent phosphor ceramics were fabricated by solid state reaction method through vacuum sintering. The effects of thickness(0.3~2.3 mm) and surface roughness(322.86 nm, 9.79 nm) of the ceramics on correlated color temperature, color rendering index, and photoelectric conversion efficiency were studied under the excitation of high power blue LED chip(3.2 V×0.3 A) and blue LD lighting(0.8 W, 1.6 W). The luminescence property can also be improved by tuning the surface roughness of the ceramics, the Ce∶YAG transparent ceramics with a roughness of 322.86 nm obtained high luminescence efficiency of 93.6 lm/W(blue light LED excitation) and 178.5 lm/W(blue light LD excitation), respectively. The results show that the luminescence performance of high power density solid-state lighting devices can be effectively improved by adjusting the thickness and surface state of Ce∶YAG transparent ceramics.