三基色白光LED光谱优化及颜色评价体系分析

Spectrum Optimization and Color Quality Evaluation of Tri-color White Light LED

随着人们对光品质的要求越来越高以及新光源的出现,光源的颜色评价体系也在不断发展,新的颜色评价体系CQS(Color Quality Scale)显示了一定的优越性。本文采用理论计算,固定相关色温为3000K,通过调配三基色白光LED光谱参数来分析CQS和CRI两种颜色评价体系的差别及寻求光视效能LER和CQS的最佳平衡。结果表明在评价白光LED光源时,CQS比CRI具有优越性。当三基色峰值波长分别为464nm、540nm和611nm,半高宽分别为20nm、30nm和20nm,Qa达到80,LER最大为396lm/W,优化后的峰值波长和半高宽的变化对CQS的影响很大,为保证LED光源的颜色稳定性,三基色峰值波长的漂移和半高宽的展宽应小于5nm。

The failure of the current CIE Color Rendering Index （CRI） for light sources （especially LED） has been demonstrated, and the new index CQS （Color Quality Scale） may replace it. In the condition of correlated color temperature of 3000K, through the deployment of tri-color white LED spectral parameters to find the best balance of the LER and CQS. The results showed that with peak wavelength at 464 nm, 540 nm and 611 nm, FWHM at 20 nm, 30 nm and 20nm, we achieve K =3961m/W, Qa =80, which is the best result when Qa more than 80 and it was found that the peak wavelength and the FWHM that had optimized have a great influence on the CQS, to ensure the stability of the LED light source, the peak wavelength shifting and the FWHM broadening of the tri-color white LED should less than 5nm.