Performance Improvement of VLC System Using GaN-Based LEDs With Strain Relief Layers
Performance Improvement of VLC System Using GaN-Based LEDs With Strain Relief Layers
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DOI：
10.1109/lpt.2016.2524623
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发表时间：
2016-05
影响因子：
2.6
通讯作者：
Huimin Lu;T. Yu;C. Jia;Yini Zhang;Jianping Wang;Guoyi Zhang
中科院分区：
文献类型：
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作者：
Huimin Lu;T. Yu;C. Jia;Yini Zhang;Jianping Wang;Guoyi Zhang
采用金属有机气相外延（MOVPE）技术制备了带超晶格应变消除层（SRL）和不带SRL的GaN基蓝色发光二极管（LED）。对不同LED的发光特性进行了实验测量和理论计算。结果表明，由于量子阱中极化电场的减小，使用 SRL 可以抑制 GaN 基 LED 的效率下降。这有利于减轻LED光输出功率注入电流(L-I)非线性。此外，使用不同的LED作为光源，还研究了可见光通信（VLC）系统的性能。结果表明，当应用具有 SRL 的 LED 时，VLC 系统性能得到改善。原因是随着 LED L-I 非线性的减轻，传输信号误差会减小。因此，具有SRL的GaN基LED可以应用于VLC以提高系统性能。
The GaN-based blue light-emitting diodes (LEDs) with superlatticelike strain relief layer (SRL) and without SRL were fabricated by metal organic vapor phase epitaxy (MOVPE). The luminescence characteristics of the different LEDs were measured experimentally and calculated theoretically. It is demonstrated that the efficiency droop of GaN-based LEDs is suppressed using the SRL due to the reduction of polarization electric field in quantum wells. This is beneficial to the mitigation of LED light output power-injection current (L-I) nonlinearity. Furthermore, using the different LEDs as light source, the performance of visible-light communication (VLC) system was also investigated. The results reveal that the VLC system performance is improved when the LEDs with SRL are applied. The reason is that the transmitted signal error decreases as the LED L-I nonlinearity mitigates. As a result, the GaN-based LEDs with SRL can be applied in the VLC to improve the system performance.