基于Ce^3+∶YAG透明陶瓷的大功率LED和LD照明原型器件的发光性能:厚度和表面粗糙度的影响

Thickness and Surface Roughness Effect on Lighting Performance of Ce^3+∶YAG Transparent Ceramics Based High Power LED and LD Lighting Prototype Devices

采用高温真空烧结技术制备了0.5%Ce∶Y 3Al5O12(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∶Y 3Al 5O 12(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.