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High-Performance Semi-Polar InGaN/GaN Green Micro Light-Emitting Diodes
- Source :
- IEEE Photonics Journal. 12:1-7
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
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.
- 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
Subjects
Details
- ISSN :
- 19430647
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- IEEE Photonics Journal
- Accession number :
- edsair.doi...........c2556c6f77efb1b68c4b4282ae9e27a1