Investigating the origin of efficiency droop by profiling the temperature across the multi-quantum well of an operating light-emitting diode
- Authors
- Jung, Euihan; Hwang, Gwangseok; Chung, Jaehun; Kwon, Ohmyoung; Han, Jaecheon; Moon, Yong-Tae; Seong, Tae-Yeon
- Issue Date
- 26-1월-2015
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.106, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 106
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94614
- DOI
- 10.1063/1.4907177
- ISSN
- 0003-6951
- Abstract
- Performance degradation resulting from efficiency droop during high-power operation is a critical problem in the development of high-efficiency light-emitting diodes (LEDs). In order to resolve the efficiency droop and increase the external quantum efficiency of LEDs, the droop's origin should be identified first. To experimentally investigate the cause of efficiency droop, we used null-point scanning thermal microscopy to quantitatively profile the temperature distribution on the cross section of the epi-layers of an operating GaN-based vertical LED with nanoscale spatial resolution at four different current densities. The movement of temperature peak towards the p-GaN side as the current density increases suggests that more heat is generated by leakage current than by Auger recombination. We therefore suspect that at higher current densities, current leakage becomes the dominant cause of the droop problem. (C) 2015 AIP Publishing LLC.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
- College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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