为优化多基色混合白光LED的显色性,得到色彩生动的白光LED照明效果,以评价饱和红色的特殊显色指数R9为研究对象,通过多基色光源混合白光LED的光谱功率分布的高斯数学模型,选取峰值波长λm、半波宽Δλ和幅值A为基色光源光谱功率分布的主要参量,并以“蓝光芯片+YAG黄色荧光粉”和“红、绿和蓝基色LED”为分析模型分别进行二基色和三基色混合白光LED显色性研究,讨论两种基色混合情况下三个参量对混色白光LED的显色性R9贡献.结果表明:为使多基色混合白光LED的显色性更好,首先确定光源S1的峰值波长λm1、半波宽Δλ1及幅值A1;然后设定其他基色光源幅值Ai以求此条件下峰值波长λmi和半波长Δλi取值范围;最后在求得的峰值波长λmi和半波长Δλi取值范围,反求基色光源的最佳幅值Aiopt,从而使多基色混合白光LED的显色性达到最佳效果.该方法对分析基色混合白光LED的显色性具有理论参考价值.

To optimize color rendering of mixed-color LEDs,the Gaussian model was used to analyze the color-mixed LED’s spectrum power distribution.The peak wavelength “λm”,spectral half width “Δλ” and amplitude “A” were basic parameters for optimizing color rendering R9,which is very important for objects to be colorful and vivid under the white light LED’s illuminating.The typical methods for color mixing were used to get white light LEDs.Result was that to get the satisfied color rendering index,one of the color primaries should be certain and then other color primaries would be analyzed through changing three basic parameters step by step.It was concluded that the analysis in this paper would be referential to optimize the color-mixed white LED’s color rendering.