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

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...

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Bibliographic Details
Published in:Applied physics letters 2009-03, Vol.94 (10)
Main Authors: Kim, Sun-Kyung, Song, Hyun Don, Ee, Ho-Seok, Choi, Hyun Min, Cho, Hyun Kyong, Lee, Yong-Hee, Park, Hong-Gyu
Format: Article
Language:English
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Summary: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 ∼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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3097017