1. High-Performance Semi-Polar InGaN/GaN Green Micro Light-Emitting Diodes
- Author
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Tao Tao, Youdou Zheng, Ting Zhi, Zili Xie, Danfeng Pan, Wang Xuan, Rong Zhang, Maogao Gong, Bin Liu, Yugang Zhou, and Fei-Fan Xu
- Subjects
010302 applied physics ,Materials science ,Pixel ,business.industry ,Visible light communication ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Polarization (waves) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Azimuth ,law ,0103 physical sciences ,Polar ,Optoelectronics ,Voltage droop ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Current density ,Light-emitting diode - Abstract
Semi-polar micro-LEDs have gain increasing interests due to the advantages of polarization control and quantum efficiency improvement. In this work, a novel semi-polar (20–21)-plane micro-LEDs array has been designed and manufactured. In comparison with c-plane micro-LEDs, semi-polar micro-LEDs indicate better electrical and optical performance. The relative EQE of semi-polar micro-LEDs remains at 62% under the injected current density of 775.6 A/cm2, which indicates a reduced efficiency droop due to less polarization in MQWs. It has been further proved by a significant reduction of 55% in emission peak blue-shift under the injected current density from 11.1 A/cm2 to 775.6 A/cm2. In addition, the carrier recombination dynamics and spatial light distribution of semi-polar micro-LEDs with different pixel sizes have been studied. Fast recombination lifetime in smaller size semi-polar micro-LEDs indicates a promising way to be used as a high modulation bandwidth light source. Stable and uniform light distribution in a wider range of spatial azimuths further supports for the semi-polar micro-LEDs as a strong candidate for the applications of high-resolution display and high-speed visible light communication.
- Published
- 2020