荧光粉受激发产生的白光LED照明光源存在显色指数较低的问题。对此提出一种利用光谱拟合反演高显指目标光谱的方法,针对已知白光LED计算提高该光源所需补充的单色光LED种类及光谱系数。利用光谱拟合方法分析添加不同波段的光谱对白光LED显指和色温的影响。并通过拟合反演的方法进行补光设计,使用一到两种单色光LED,将冷白光源和中性白光源的显指分别提高至92.3和96.8。实验结果表明,使用红光与蓝绿光、低波长绿光LED补光后,大幅度提高了荧光粉受激发产生的白光LED光源的显色性。

CRI of LED white light sources realized by exciting phosphors is relatively low. An inversion method was supposed to improve the white LED CRI through fitting target spectrum of high CRI. Wavelength and spectral coefficients of monochromatic LEDs used to improve CRI of white sources were calculated. The effects on CRI and CCT of supplementary in different wavelength were analyzed. By using one or two kinds of monochromatic LEDs,CRI of a cool white LED and a neutral white LED were separately increased to 92.3 and 96.8. The experimental results show that using white light and bluegreen light or lowwavelength green light LEDs for supplementary can obviously increase the color rendering of white light LEDs.