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Metal mirror assisting light extraction from patterned AlGaInP light-emitting diodes

Authors
Kim, Sun-KyungSong, Hyun DonEe, Ho-SeokChoi, Hyun MinCho, Hyun KyongLee, Yong-HeePark, Hong-Gyu
Issue Date
9-3월-2009
Publisher
AMER INST PHYSICS
Keywords
aluminium compounds; gallium compounds; III-V semiconductors; indium compounds; light absorption; light emitting diodes; mirrors; photonic crystals; reflectivity
Citation
APPLIED PHYSICS LETTERS, v.94, no.10
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
94
Number
10
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120436
DOI
10.1063/1.3097017
ISSN
0003-6951
Abstract
We demonstrate light extraction from metal reflector-based AlGaInP photonic crystal (PhC) light-emitting diodes (LEDs). The photons reflected by a high-reflectivity, small-absorption, bottom Ag mirror steadily interact with the PhC, and thus enhanced light extraction is achieved. The square lattice PhC patterns are fabricated on an upper n-doped AlGaInP surface with a depth of 500 nm. An optical power measurement using an integration sphere shows that the extraction efficiency of the PhC LED is similar to 1.8 times larger than that of the nonpatterned LED. A three-dimensional finite difference time domain simulation is performed to understand the output enhancement extracted by the PhC and the effect of internal absorption.
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