氮化镓基白光发光二极管的快中子辐照效应
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作者单位:

1.重庆大学 光电技术及系统教育部重点实验室,重庆 400044;2.成都理工大学 核技术与自动化工程学院,四川 成都 610059;3.电子科技大学 电子科学与工程学院,四川 成都 610054

作者简介:

魏 彪 (1963-),男,浙江省嘉兴市人,研究员,主要研究方向为光电成像及测控技术与系统 .email:weibiao@cqu.edu.cn.

通讯作者:

李 沫 email:limo@uestc.edu.cn

基金项目:

国家自然科学基金资助项目(61804141)

伦理声明:



Fast neutron irradiation effects on white Gallium Nitride light-emitting diodes
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Affiliation:

1.Key Laboratory of Optoelectronic Technology and Systems,Ministry of Education,Chongqing University, Chongqing 400044,China;2.The College of Nuclear Technology and Automation Engineering, Chengdu University of Technology,Chengdu Sichuan 610059,China;3.School of Electronic Science and Engineering, University of Electronic Science and Technology of China,Chengdu Sichuan 610054,China

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    摘要:

    对注入量为1×1014 cm-2的快中子(1.2 MeV)对氮化镓(GaN)基白光发光二极管(LED)器件的辐照效应进行研究。通过测量和分析器件的电致发光谱(EL)、光功率-电流(L-I)和电流-电压(I-U)特性,发现器件辐照后光功率降低,而EL谱形状几乎没有变化,表明该注入量的中子辐照主要对器件中的蓝光LED芯片造成了损伤。进一步分析发现,中子辐照导致蓝光LED量子阱中产生大量非辐射复合中心,增加了漏电流并减小了量子阱中载流子密度,从而降低LED的输出光功率。由此,在原有GaN基蓝光LED等效电路模型的基础上,加入由中子辐照导致的影响因素,不仅有助于理解中子辐照对LED光功率的衰退影响机理,还为预测辐照后光功率的变化提供了可行性。

    Abstract:

    The irradiation effect of fast neutrons(1.2 MeV) on Gallium Nitride(GaN) white Light-Emitting Diodes(LEDs) with fluence of 1×1014 cm-2 is reported. The Electroluminescence(EL) spectrum, output power-current(L-I) and current-voltage(I-U) characteristics of the device are measured and analyzed. It is found that the optical output power decreasing after irradiation, while the shape of the EL spectrum almost remains unchanged, indicating that the neutron irradiation mainly causes damage to the blue LED chip. Further analysis shows that neutron irradiation leads to the generation of a large number of nonradiative recombination centers in the quantum well, which increases the leakage current and decreases the carrier density, thus reducing the output power of LED. In addition, the influencing factors caused by neutron irradiation are added to the original equivalent circuit model of GaN-based LEDs. This model not only helps to understand the mechanism of the degradation of the neutron irradiation on the LED output power, but also provides a feasible method to predict the change of the output power after irradiation.

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魏彪,傅翔,汤戈,陈飞良,李沫.氮化镓基白光发光二极管的快中子辐照效应[J].太赫兹科学与电子信息学报,2022,20(6):543~548

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  • 收稿日期:2021-12-31
  • 最后修改日期:2022-02-28
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  • 在线发布日期: 2022-07-11
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