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陕西科技大学 电气与信息工程学院,陕西 西安,710021
纸质出版日期:2012-11-10,
收稿日期:2012-7-17,
修回日期:2012-9-20,
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李艳菲, 张方辉, 张静. 大功率LED的电流老化特性分析[J]. 发光学报, 2012,(11): 1236-1240
LI Yan-fei, ZHANG Fang-hui, ZHANG Jing. The Accelerated Aging Characterization of High Power LED[J]. Chinese Journal of Luminescence, 2012,(11): 1236-1240
李艳菲, 张方辉, 张静. 大功率LED的电流老化特性分析[J]. 发光学报, 2012,(11): 1236-1240 DOI: 10.3788/fgxb20123311.1236.
LI Yan-fei, ZHANG Fang-hui, ZHANG Jing. The Accelerated Aging Characterization of High Power LED[J]. Chinese Journal of Luminescence, 2012,(11): 1236-1240 DOI: 10.3788/fgxb20123311.1236.
基于一体化封装技术
先将铝基板进行硬质阳极氧化处理使其绝缘
后将蓝光LED芯片直接封装到铝基板上
分别制成大功率白光和蓝光LED
其中白光LED由蓝光芯片涂覆YAG:Ce荧光粉制成。将白光和蓝光LED分别用500 mA和700 mA电流加速老化1 000 h
平均每间隔24 h测试其各种光学参数
对比蓝光LED与白光LED的衰减情况。白光LED的光通量衰减比蓝光严重
但白光光功率的衰减比蓝光慢。LED的衰减分为两个阶段:第一阶段芯片与荧光粉同时衰减;第二阶段主要是芯片的衰减
荧光粉衰减较慢。
Insulation layer of aluminum substrate for LED encapsulation was made by hard anodizing technology. White and blue GaN-based light-emitting diodes were encapsulated on the aluminum plate directly. White LED was fabricated by blue chip coated with YAG:Ce phosphor
while blue LED didn't coated with phosphor. Accelerated aging tests at 500 mA and 700 mA were carried out for about 1 000 h on the new type of integrated high-power. Then optical parameters of LEDs were tested per 24 h. Compared with the blue and white LED
we could get the following conclusions: White LED luminous flux attenuates seriously than the blue LED
while optical power is opposite. There are two stages in LED attenuation: The chip and phosphor decay at the same time in initial stage of aging
well blue chip attenuation is dominant after a certain period of time.
一体化封装LED老化失效分析
integration packageLEDagingfailure mechanism
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