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白光LED衰减的光谱分析
引用本文:方福波,王垚浩,宋代辉,余彬海.白光LED衰减的光谱分析[J].发光学报,2008,29(2):353-357.
作者姓名:方福波  王垚浩  宋代辉  余彬海
作者单位:佛山市国星光电股份有限公司,广东,佛山,528000
基金项目:国家高技术研究发展计划(863计划)
摘    要:为了研究白光LED衰减的机理,通过试验跟踪并分析了采用YAG荧光粉、荧光粉晶片、RGB三合一方式封装的PLCC-4型白光LED,以及采用YAG荧光粉封装的大功率白光LED的发射光谱老化衰减曲线。试验在相同的环境下,对上述四种类型的白光LED进行了通电老化,同一类型白光LED老化电流及时间相同,老化完成后测试其光谱分布。通过分析光谱分布曲线的变化来研究白光中各色光的衰减情况,通过对比各色光的衰减情况来推断白光LED的衰减原因。分析表明白光LED的衰减主要是由蓝光LED的衰减及荧光粉的猝灭引起:采用YAG荧光粉、采用荧光粉晶片及RGBLED封装的白光LED衰减特性基本相同,白光的衰减主要是由蓝光的衰减引起;大功率白光LED与PLCC-4型白光LED衰减特性稍有不同,白光的衰减除了因蓝光的衰减外,还有荧光粉的衰减所引起的白光衰减,而蓝光的衰减所占比例至少不低于80%。通过上述分析可以进一步推断:在散热条件足够理想的情况下,白光LED的衰减主要由蓝光的衰减引起,而随着系统温度的提升,荧光粉的衰减将加剧白光LED的衰减。所得结果将为白光LED的应用及进一步对白光LED衰减原因的研究提供了参考。

关 键 词:白光LED  荧光粉  RGBLED  大功率LED  衰减
文章编号:1000-7032(2008)02-0353-05
修稿时间:2007年5月26日

Spectroscopic Analysis of White LED Attenuation
FANG Fu-bo,WANG Yao-hao,SONG Dai-hui,YU Bin-hai.Spectroscopic Analysis of White LED Attenuation[J].Chinese Journal of Luminescence,2008,29(2):353-357.
Authors:FANG Fu-bo  WANG Yao-hao  SONG Dai-hui  YU Bin-hai
Abstract:To study how the attenuation of white LED happens and develops, four types of white LED are studied in this paper. Three of them are PLCC-4 type white LED and the other is power white LED. And the PLCC-4 type white LEDs are encapsulated by YAG phosphors, phosphors wafer or RGB LED respectively. The power white LED is encapsulated by YAG phosphors. Four types white LED are lighted continuously and the same type LED is lighted under the same conditions, such as electrical current, environment temperature, and so on. The emission spectra of them are studied in a interval. Usually, the interval is one week time. In this paper, the attenuation of red, green and blue emission is analysed by studying the emission spectrum change, through which to deduce the attenuation of white LED. Four types of white LED were studied and the results indicate that the attenuation mostly results from attenuation of blue LEDs and quenching of phosphors. The attenuating course of PLCC-4 type of white LED encapsulated by phosphors wafer and RGB LED is the same with that encapsulated by YAG phosphors, which is results from the blue LED only. The attenuating course of power white LED is different from PLCC-4 type white LED. Not only attenuation of blue LEDs is the cause of attenuation of power white LED, no less than 80 percent, but quenching of phosphors is also the other factor. More conclusion could be deduced from the study that if radiator is enough perfectly, the attenuation of white LED results from the attenuation of blue LED, but as the system temperature raises, the quenching of phosphors would happen and which will enhance the attenuation of white LED. In this paper, the attenuation of red, green and blue emission are studied by tracking and analysing their spectrum change to deduce the attenuation mechanism of white LED, and the results will provide a reference to the application of white LED and for the further study.
Keywords:white LED  phosphors  RGB LED  power LED  attenuation
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