期刊
JOURNAL OF LUMINESCENCE
卷 231, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2020.117806
关键词
Ultraviolet LED; GaN/AlGaN multiple quantum wells; First barrier; Doping concentration; Screening effect
类别
资金
- National Natural Science Foundation of China [62074129]
- Natural Science Foundation of Shaanxi Province [2019JM-452]
- Fundamental Research Funds for the Central Universities
The electroluminescence characteristics of GaN/AlGaN multiple-quantum-well ultraviolet light-emitting diodes (LEDs) with different concentrations of silicon impurities in the first AlGaN barrier layer near the N-type GaN region were investigated numerically. The study found that as the Si-doping concentration increases, the LED's electroluminescence spectrum blueshifts and its peak intensity increases first and then decreases. The ionization of silicon impurities alters the effective potential height and width of the first barrier layer, allowing more electrons to be injected into the active region and enhancing luminescence efficiency, but excessive impurity concentration can lead to hole leakage and reduction in luminescence intensity.
The electroluminescence characteristics of GaN/AlGaN multiple-quantum-well ultraviolet light-emitting diodes (LEDs) with different concentrations of silicon impurities in the first AlGaN barrier layer near the N-type GaN region is investigated numerically. It is found that the LED's electroluminescence spectrum blueshifts and its peak intensity increases first and then decreases, as the Si-doping concentration increases. This is because that the effective potential height and width of the first barrier layer is reduced due to the screening effect by the ionization of silicon impurities. As a result, more electrons can be injected into the active region, enhancing the luminescence efficiency. However, when the impurity concentration is too high, the leakage of holes may become severe, leading to a reduction of the luminescence intensity for the most heavily doped sample at the injection current of 20 mA.
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