【摘要】 为了实现高光效、高显色性且色温可调的白光LED,对四种单基色蓝、绿、黄、红光LED的混光进行了研究。基于Yoshi-单色光模型和光的叠加原理,通过改变四种LED芯片的组合方式(峰值波长、相对光功率配比),对不同色温区的混合白光的显色指数(Ra)、色品质数(Qa)和光视效能(K)进行了仿真计算和光谱优化选择。结果表明:在2 700~6 500K色温范围内,峰值波长为445nm,500nm,560nm,620nm的组合可以得到高Ra值和高Qa值;峰值波长为445nm,535nm,590nm,615nm的组合可以得到较高K值。此外还分析了组合白光LED光谱参数对Ra、Qa、K及相关色温的影响。更多还原

【Abstract】 In order to obtain white lighting with high color quality and luminous efficacy,color temperature tunable white LEDs with blue,green,yellow and red chips were studied.Based on Yoshi-Models and color mixing theory,optimizations were carried out on the spectrum to obtain high color rendering index(Ra),color quality scale(Qa)and luminous efficacy(K).By changing combinations(peak wavelength and optical power ratio)of four monochromatic LEDs,white LEDs under different color temperature(Tc)are obtained. Within tunable color temperature ranging from 2 700 Kto 6 500 K,a combination of 445,500,560 and 620nm realizes the highest Raand Qa,while the combination of 445,535,590 and 615nm realizes the highest K value.Further analysis on the effects of white LED’s spectrum parameters on Ra,Qa,Kand Tc are presented.更多还原