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Effect of Green Quantum Well Number on Properties of Green GaN-Based Light-Emitting Diodes

Effect of Green Quantum Well Number on Properties of Green GaN-Based Light-Emitting Diodes
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摘要 In GaN-based green light-emitting diodes(LEDs) with different green quantum well numbers grown on Si(111)substrates by metal organic chemical vapor deposition are investigated. It is observed that V-shaped pits appear in the AFM images with the green quantum well number increasing from 5 to 9, and results in larger reverse-bias leakage current. Meanwhile, in the case of the sample with the number from 5 to 7 then to 9, the external quantum efficiency increases firstly, and then decreases. These phenomena may be related to the size of V-shaped pits in the active area and the distribution of electrons and holes in the active area caused by V-shaped pits. The optimal number of green quantum wells is determined to be 7. In GaN-based green light-emitting diodes(LEDs) with different green quantum well numbers grown on Si(111)substrates by metal organic chemical vapor deposition are investigated. It is observed that V-shaped pits appear in the AFM images with the green quantum well number increasing from 5 to 9, and results in larger reverse-bias leakage current. Meanwhile, in the case of the sample with the number from 5 to 7 then to 9, the external quantum efficiency increases firstly, and then decreases. These phenomena may be related to the size of V-shaped pits in the active area and the distribution of electrons and holes in the active area caused by V-shaped pits. The optimal number of green quantum wells is determined to be 7.
作者 Zhi-Hui Wang Xiao-Lan Wang Jun-Lin Liu Jian-Li Zhang Chun-Lan Mo Chang-Da Zheng Xiao-Ming Wu Guang-Xu Wang Feng-Yi Jiang 王智辉;王小兰;刘军林;张建立;莫春兰;郑畅达;吴小明;王光绪;江风益(National Engineering Technology Research Center for LED on Si Substrate, Nanchang University)
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第8期79-82,共4页 中国物理快报(英文版)
基金 Supported by the National Key Research and Development Program of China under Grant No 2016YFB0400601 the National Natural Science Foundation of China under Grant Nos 61704069,11674147,61604066,51602141 and 11604137
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