摘要
对封装的蓝光和白光LED进行了光衰对比试验,结果表明,白光LED初期衰减明显比蓝光LED快。因此,又对自制的YAG:Ce3+荧光粉进行了光照、温度测试,结果发现,荧光粉在光照作用下,荧光强度出现先降后升然后稳定的现象,跟白光LED的衰减相吻合,结合色坐标的偏移,蓝光LED本身的衰减仍是白光LED衰减的主要原因。
We traced three group of LEDs,the light output degradation and color shift properties as a function of time were measured. The curve indicate that white-LED＇s degradation is faster than that of blue-LED, especially during the beginning 250 hours. So two experiments were conducted on our YAG：Ce^3＋ phosphor. A blue-LED lighting and a oven were used to test the YAG： Ce^3＋ phosphor. After 246 hours, the fluorescence intensity of phosphor decreased 14. 2 %, then, it increased to 91.4% of initial value,which just explained the degradation of white-LED. According to the data,it can be seen that the temperature has no effect on the phosphor,and the blue-LED＇degradation is the main reason for the degradation of white LED.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2008年第4期453-455,共3页
Journal of Optoelectronics·Laser
基金
山东省攻关资助项目(2005GG1107001)
关键词
白光LED
光衰
YAG:Ce^3+荧光粉
荧光强度
色坐标
white-LED
light output degradation
YAG： Ce^3＋ phosphor
fluorescence intensity
chromaticity coordinate/CIE x,y values
