利用ASAP光学分析软件, 对Ce3+∶YAG荧光陶瓷封装白光LED的出光特性进行了模拟分析。结果表明, 当Ce3+∶YAG荧光陶瓷掺杂浓度一定时, 随着荧光陶瓷厚度的增加, LED的光效呈现出先增大后减小的趋势, 其相关色温值则一直减小直至稳定在低色温, 色坐标值将持续增大, 在CIE图中移向黄色区域; 荧光陶瓷的厚度存在最佳值, 使得LED光效达到最大值, 且随着荧光陶瓷掺杂浓度的增加, 最佳封装厚度减小。随着陶瓷基片封装距离的增加, 合成白光的光通量、光效和色坐标均逐渐增加, 而色温值则逐渐减小, 致使LED发光相对偏暖。

Using the optical analysis software ASAP, the photoluminescence properties about Ce3+-doping YAG fluorescent ceramics are simulated. The results show that for a given Ce3+-doped density, with the increasing of the thickness of the fluorescent ceramics, the luminous flux of the white LED packaged by Ce3+-doping YAG fluorescent ceramics first increases and then decreases, whereas the correlated color temperature gradually decreases and then keeps a low value. The color coordinates keeps increasing to the yellow area in the CIE. There exists an optimal thickness of the fluorescent ceramics, resulting in the maximum luminous efficiency. Meanwhile, the optimal thickness of the fluorescent ceramics decreases with the increasing of the Ce3+-doped density. With the increasing of the packaging distance of the fluorescent ceramics to the LED chip, the luminous flux, color coordinates and efficiency of the white LED gradually increase, while the correlated color temperature gradually decreases, and the light of LED trends warm.