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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。
The ASAP optical analysis software was used to simulate the light-emitting characteristics of Ce3 +: YAG fluorescent white ceramic encapsulated LEDs. The results show that with the doping concentration of Ce3 +: YAG fluorescent ceramics constant, with the increase of the thickness of the fluorescent ceramics, the light efficiency of LED first increases and then decreases, and the correlated color temperature value decreases until it stabilizes at low color temperature , The color coordinate value will continue to increase and move to the yellow area in the CIE image; the thickness of the fluorescent ceramic has the best value, so that the LED luminous efficiency reaches a maximum value. With the increase of the doping concentration of the fluorescent ceramic, the optimal package thickness Decrease With the ceramic substrate package distance increases, the luminous flux of synthetic white light, light efficiency and color coordinates are gradually increased, while the color temperature value is gradually reduced, resulting in relatively warm LED light.