Spectroscopic Analysis of White LED Attenuation

FANG Fu-bo; WANG Yao-hao; SONG Dai-hui; YU Bin-hai

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Spectroscopic Analysis of White LED Attenuation

更新时间：2020-08-12

- Spectroscopic Analysis of White LED Attenuation
- Chinese Journal of Luminescence Vol. 29, Issue 2, Pages: 353-357(2008)
- 作者机构：
  
  佛山市国星光电股份有限公司,广东佛山,528000
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Published：20 March 2008，
  
  Received：26 May 2007，
  
  Revised：29 January 2008，
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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

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
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 DOI：

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 DOI：

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。

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.

关键词

白光LED荧光粉RGBLED大功率LED衰减

Keywords

white LEDphosphorsRGB LEDpower LEDattenuation

references

Wu Haibin,Wang Changling.Experimental research on influence of packing materials of white LED on its luminous decay[J].Acta Optica Sinica (光学学报),2005,25(8):1091-1094 (in Chinese).

Lin Liang,Chen Zhizhong,Chen Ting,et al.Characteristics of the accelerated aging white LEDs[J].Chin.J.Lumin.(发光学报),2005,26(5):617-621 (in Chinese).

Wang Yaohao,Yu Binhai,Li Shunmian.Analysis and simulation of thermal characteristic on die bonding materials of power LED[J].J.Foshan Univ.(Natural Science Edition)(佛山科学技术学院学报(自然科学版)),2005,23(4):14-17 (in Chinese).

Yu Binhai,Li Xufeng.Impact of flipchip substrate adhesive on the thermal characteristic of high power LED[J].Semiconductor Technology (半导体技术),2005,30(6):49-51,55 (in Chinese).

Yu Binhai,Wang Yaohao.Junction temperature and thermal resistance restrict the developing of high-power LED[J].Chin.J.Lumin.(发光学报),2005,26(6):761-766 (in Chinese).

Li Binqian,Bu Liangji,Fan Guanghan.A new method measuring thermal resistance of power LED[J].Semiconductor Optoelectronics (半导体光电),2003,24(1):22-24 (in Chinese).

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