Investigating the origin of efficiency droop by profiling the voltage across the multi-quantum well of an operating light-emitting diode
- Authors
- Kim, Taewoong; Seong, Tae-Yeon; Kwon, Ohmyoung
- Issue Date
- 6-6월-2016
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.108, no.23
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 108
- Number
- 23
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88359
- DOI
- 10.1063/1.4953401
- ISSN
- 0003-6951
- Abstract
- Efficiency droop is a phenomenon in which the efficiency of a light-emitting diode ( LED) decreases with the increase in current density. To analyze efficiency droop, direct experimental observations on the energy conversion occurring inside the LED is required. Here, we present the measured voltage profiles on the cross section of an operating LED and analyze them with the cross-sectional temperature profiles obtained in a previous study under the same operation conditions. The measured voltage profiles suggest that with increases in the injection current density, electron depletion shifts from the multi-quantum well through an electron blocking layer to the p-GaN region. This is because electron leakage increases with increases in current density. Published by AIP Publishing.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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