Enhanced light extraction efficiency of micro-ring array AlGaN deep ultraviolet light-emitting diodes
SCIE
SCOPUS
- Title
- Enhanced light extraction efficiency of micro-ring array AlGaN deep ultraviolet light-emitting diodes
- Authors
- Fayisa, Gabisa Bekele; Lee, Jong Won; Kim, Jungsub; Kim, Yong-Il; Park, Youngsoo; Kim, Jong Kyu
- Date Issued
- 2017-09
- Publisher
- IOP PUBLISHING LTD
- Abstract
- An effective approach to overcome inherently poor light extraction efficiency of AlGaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) is presented. We demonstrated the 5 x 5 array micro-ring DUV LED having an inclined sidewall at the outer perimeter and a p-GaN-removed inner circle of the micro-ring, together with MgF2/Al omnidirectional reflectors. The micro-ring array DUV LED shows remarkably higher light output power by 70% than the reference, consistent with the calculated result, as well as comparable turn-on and operational voltages, which are attributed to the effective extraction of strong transverse-magnetic polarized anisotropic emission and the reduction of the absorption loss by the p-GaN contact layer, simultaneously. (C) 2017 The Japan Society of Applied Physics
- Keywords
- INPLANE EMISSION; UV LEDS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92038
- DOI
- 10.7567/JJAP.56.092101
- ISSN
- 0021-4922
- Article Type
- Article
- Citation
- JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 56, no. 9, 2017-09
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