白光发光二极管的制备技术及主要特性  

Fabrication and Characteristics of White Light-emitting Diode

作　　者：蒋大鹏[1] 赵成久[2] 侯凤勤[2] 刘学彦[2] 范翊[2] 张立功[1] 褚明辉[2] 申德振[1] 范希武[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所激发态物理重点实验室,吉林长春130033 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130022

出　　处：《发光学报》2003年第4期385-389,共5页Chinese Journal of Luminescence

基　　金：中国科学院知识创新工程;吉林省科技厅重点项目资助项目

摘　　要：利用发射波长为470nm的蓝光发光二极管作为基础光源,通过荧光粉转换方法制备白光发光二极管,荧光粉主要采用稀土激活的铝酸盐Y3Al5O12∶Ce3+(YAG)。在工作电流为15mA条件下,所研制的白光LED的法向光强为2890mcd;色坐标为x=0 29,y=0 33;显色指数为77;流明效率为14 9lm/W。研究制备了不同色温的白光LED,色温范围从2700～8000K,研究了色温与色坐标之间的对应关系。并且与国外同类产品进行比较,部分指标已经超过了国外同类产品水平。White lightemitting diodes were fabricated by phosphor conversion. The blue LED chip (470nm, GaNbased) was used as primary light source and Y3Al5O12∶Ce3+ (YAG) phosphors was used as light changing materials. The excitation spectrum peak of the phosphor is the same as the luminescent peak of blue chip at 470nm. The PL spectrum peak of the phosphors is at 570nm. The white light was yielded by mixing 470nm with 570nm. The luminescent intensity of white LED is 2 890mcd. The color coordinates of white LED is x=029, y=033 and the color index is 77. The efficiency of the white LED is 149 lm/W. The light conversion efficiency of phosphors is 269 from blue LED to white LED. The white LEDs with different color temperature from 2 700～8 000K were fabricated. The relationship between the color temperature and the color coordinates of white LED was investigated. When the color temperature is under 3 700K, the color coordinates x and y are bigger than 04. When the color temperature is above 8 000K, the color coordinates x and y are smaller than 03. When the color coordinates x and y are 033 respectively, the color temperature is about 5 500K. 

关 键 词：白光发光二极管 制备技术 荧光粉转换方法 白光LED 特性 

分 类 号：TN312.8[电子电信—物理电子学]