Design principles of external and internal patterns for efficient light extraction
- Authors
- Kim, Sun-Kyung; Park, Hong-Gyu
- Issue Date
- 2월-2014
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Light-emitting diodes; Finite-difference time-domain method; Photonic crystal
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.64, no.3, pp.471 - 475
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 64
- Number
- 3
- Start Page
- 471
- End Page
- 475
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99438
- DOI
- 10.3938/jkps.64.471
- ISSN
- 0374-4884
- Abstract
- We studied external and internal patterns for boosting light extraction from GaN light-emitting diodes (LEDs). With a transparent conductive layer (TCL) inserted between an external pattern and an upper GaN plane, light extraction increased in a thin, high-refractive-index TCL. A periodic array of air voids embedded in a GaN medium yielded an extraction efficiency similar to the external pattern's one. For double-layer patterns, as the internal pattern was close to multiple quantum wells within a wavelength, the extraction efficiency was enhanced similar to 30% over that of a single-layer pattern. This work will be useful for designing blue-to-ultraviolet-emitting GaN-based LEDs with multi-layer patterns.
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