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Theoretical demonstration of enhancement of light extraction of flip-chip GaN light-emitting diodes with photonic crystals

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3 Author(s)
Chao, Chia-Hsin ; Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 1406 West Green Street, Urbana, Illinois 61801 ; Chuang, S.L. ; Wu, Tzong-Lin

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The authors demonstrate, using finite-difference time-domain modeling, an enhancement in the extraction efficiency of flip-chip GaN light-emitting diodes (LEDs) using photonic crystals. The authors compare the extraction efficiencies of four configurations of a flip-chip GaN LED: with and without photonic crystal (PhC) layers, with a perfect reflecting mirror, and a bottom PhC reflector on GaN in combination with a top PhC extractor on sapphire. The authors show that, by using a photonic crystal layer as a bottom reflector, they can enhance the extraction efficiency similar to that of a mirror, yet the PhC reflector has the advantage that the metallic mirror loss can be avoided.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 9 )

Date of Publication:

Aug 2006

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