结温对DCJTB混合YAG∶Ce^(3+)白光LED光谱特性的影响  

The Influence of Junction Temperature on the White LED Spectral Characteristics of the Mixture of the DCJTB and YAG∶Ce^(3+)

作　　者：梁田静[1] 张方辉[1] 屈少君[2] 韩亮[1] 邱西振[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021 [2]南京林业大学木材工业学院,江苏南京210037

出　　处：《光谱学与光谱分析》2013年第2期490-493,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61076066);陕西科技大学博士基金项目(BJ09-07);陕西科技大学自然科学基金项目(ZX09-31)资助

摘　　要：研究了结温变化对DCJTB混合YAG∶Ce3+荧光粉的白光LED光谱特性的影响。采用分层点粉的方法,在LED芯片上分层涂覆YAG荧光粉和有机材料DCJTB,可以使器件的显色指数高达90。利用实验室自行研发的一体化LED散热支架可方便准确测量出结温。实验表明:结温升高使蓝光芯片辐射幅值不断下降,YAG荧光粉被激发所辐射的黄光辐射幅值先增大后减小,红光光谱发生蓝移,器件的显色指数呈线性下降,色温先增大后减小。The present paper mainly studies the influence of the junction temperature on the white LED spectral characteristics of the mixture of the DCJTB and YAG ： Ce^3＋ phosphor. With layered coating of YAG phosphor and organic materials DCJTB on the LED chip with the method of hierarchical point powder, the color rendering index of the device will reach up to 90. The junc-tion temperature can be measured conveniently and accurately with the integrated LED cooling pad which was developed by the laboratory. Experiments show that： the rise of the junction temperature can make the radiation amplitude of the blue chip decline continuously. The yellow radiation amplitude of YAG phosphor which is excited by radiation first increases and then decreases, the red spectrum is blue-shifted, the color rendering index of the device decreased linearly, while the color temperature first in-creases and then decreases.

关 键 词：白光LED结温 显色指数 光谱特性 

分 类 号：O433.5[机械工程—光学工程]