中国物理B ›› 2013, Vol. 22 ›› Issue (10): 106108-106108.doi: 10.1088/1674-1056/22/10/106108

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Accurate measurement and influence on device reliability of defect density of a light-emitting diode

郭祖强, 钱可元   

  1. Key Laboratory of Information Science and Technology, Graduate School of Tsinghua University at Shenzhen, Shenzhen 518055, China
  • 收稿日期:2013-03-21 修回日期:2013-05-21 出版日期:2013-08-30 发布日期:2013-08-30
  • 基金资助:
    Project supported by the Upgrading Project of Shenzhen Key Laboratory of Information Science and Technology, China (Grant No. CXB20l00525038A), the Shenzhen Science and Technology Development Plan, China (Grant No. 2009003), and the Science and Technology Program of Nanshan District, Shenzhen, China (Grant No. 2011015).

Accurate measurement and influence on device reliability of defect density of a light-emitting diode

Guo Zu-Qiang (郭祖强), Qian Ke-Yuan (钱可元)   

  1. Key Laboratory of Information Science and Technology, Graduate School of Tsinghua University at Shenzhen, Shenzhen 518055, China
  • Received:2013-03-21 Revised:2013-05-21 Online:2013-08-30 Published:2013-08-30
  • Contact: Qian Ke-Yuan E-mail:qianky@sz.tsinghua.edu
  • Supported by:
    Project supported by the Upgrading Project of Shenzhen Key Laboratory of Information Science and Technology, China (Grant No. CXB20l00525038A), the Shenzhen Science and Technology Development Plan, China (Grant No. 2009003), and the Science and Technology Program of Nanshan District, Shenzhen, China (Grant No. 2011015).

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摘要： A method of accurately measuring the defect density of a high-power light-emitting diode (LED) is proposed. The method is based on measuring the number of emitting photons in the magnitude of 105 under the injection current as weak as nA and calculating the non-radiative recombination coefficient which is related to defect density. Defect density is obtained with the self-developed measurement system, and it is demonstrated that defect density has an important influence on LED optical properties like luminous flux and internal quantum efficiency (IQE). At the same time, a batch of GaN-based LEDs with the chip size of 1 mm×1 mm are selected to conduct the accelerated aging tests lasting for 1000 hours. The results show that defect density exhibits a greater variation and is more sensitive to LED reliability than luminous flux during aging tests. Based on these results, it is concluded that for the GaN-based LED with a chip size of 1mm×1mm, if its defect density is over 1017/cm3, the LED device performance suffers a serious deterioration, and finally fails.

关键词: accurate measurement, defect density, LED, reliability

Abstract: A method of accurately measuring the defect density of a high-power light-emitting diode (LED) is proposed. The method is based on measuring the number of emitting photons in the magnitude of 105 under the injection current as weak as nA and calculating the non-radiative recombination coefficient which is related to defect density. Defect density is obtained with the self-developed measurement system, and it is demonstrated that defect density has an important influence on LED optical properties like luminous flux and internal quantum efficiency (IQE). At the same time, a batch of GaN-based LEDs with the chip size of 1 mm×1 mm are selected to conduct the accelerated aging tests lasting for 1000 hours. The results show that defect density exhibits a greater variation and is more sensitive to LED reliability than luminous flux during aging tests. Based on these results, it is concluded that for the GaN-based LED with a chip size of 1mm×1mm, if its defect density is over 1017/cm3, the LED device performance suffers a serious deterioration, and finally fails.

Key words: accurate measurement, defect density, LED, reliability

中图分类号:  (III-V and II-VI semiconductors)

  • 61.72.uj
78.20.Jq (Electro-optical effects) 78.60.Fi (Electroluminescence)