Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells

LI Jin-chai; JI Gui-lin; YANG Wei-huang; JIN Peng; CHEN Hang-yang; LIN Wei; LI Shu-ping; KA

doi:10.3788/fgxb20163705.0513

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Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells

更新时间：2020-08-12

- Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells
- Chinese Journal of Luminescence Vol. 37, Issue 5, Pages: 513-518(2016)
- 作者机构：
  
  1. 中国科学院半导体研究所半导体材料科学重点实验室北京,100083
  2. 厦门大学物理系, 福建省半导体材料及应用重点实验室, 半导体光电材料及其高效转换器件协同创新中心,福建厦门,361005
- 作者简介：
- 基金信息：
  
  "863"
- DOI：10.3788/fgxb20163705.0513
  CLC： O472
- Received：18 January 2016，
  
  Revised：03 March 2016，
  
  Published：05 May 2016
- 稿件说明：
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李金钗, 季桂林, 杨伟煌等. 高Al组分AlGaN多量子阱结构材料发光机制探讨[J]. 发光学报, 2016,37(5): 513-518

LI Jin-chai, JI Gui-lin, YANG Wei-huang etc. Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells[J]. Chinese Journal of Luminescence, 2016,37(5): 513-518
李金钗, 季桂林, 杨伟煌等. 高Al组分AlGaN多量子阱结构材料发光机制探讨[J]. 发光学报, 2016,37(5): 513-518 DOI： 10.3788/fgxb20163705.0513.

LI Jin-chai, JI Gui-lin, YANG Wei-huang etc. Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells[J]. Chinese Journal of Luminescence, 2016,37(5): 513-518 DOI： 10.3788/fgxb20163705.0513.

摘要

紫外LED的发光功率和效率还远不能令人们满意

波长短于300 nm的深紫外LED的发光效率普遍较低。厘清高Al组分AlGaN多量子阱结构的发光机制将有利于探索改善深紫外LED的发光效率的新途径、新方法。为此

本文通过金属有机气相外延技术外延生长了表面平整、界面清晰可辨且陡峭的高Al组分AlGaN多量子阱结构材料

并对其进行变温光致发光谱测试

结合数值计算

深入探讨了AlGaN量子阱的发光机制。研究表明

量子阱中具有很强的局域化效应

其发光和局域激子的跳跃息息相关

而发光的猝灭则与局域激子的解局域以及位错引起的非辐射复合有关。

Abstract

The quantum efficiency of deep UV light emitting diodes (LED) drops dramatically with the increasing of Al content. Understanding the emission mechanism of high Al-content AlGaN multiple quantum wells (MQW) is the one of the most important objects for improving the quantum efficiency of deep UV LED. In this work

high Al-content AlGaN MQW structure with atomically flat hetero-interfaces was grown and characterized by photoluminescence (PL) measurements at different temperatures. The results indicate that there is a strong exciton-localization effect in the MQW structure and the emission is closely related to the hopping of the excitons. Due to the exciton delocalization and nonradiative recombination at defects

the PL intensity is strongly quenched at high temperatures.

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references

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