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Proceedings Paper

Electrically pumped grating-assisted resonant-cavity light-emitting diodes
Author(s): Danae Delbeke; Carl Sys; Ingrid Moerman; Peter Van Daele; Roel G. Baets
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Paper Abstract

The Grating -Assisted Light-Emitting Diode, an LED design for high brightness based on a resonant cavity containing 1D or 2D periodically corrugated layers (grating), is subject of this presentation. The diffractive properties of the wavelength scaled periodic grating integrated in one or both of the interfaces of the resonant-cavity, can redirect the laterally propagating resonant guided mode to an extractable direction. Because of the high power fraction in these guided modes, the use of such gratings can result in a higher extraction efficiency than a homogeneously layered RCLED, in which the trapped guided mode is a loss of power. In this scope, a generally applicable rigorous electromagnetic analysis based on the Coupled Wave Theory for diffractive gratings, has been developed to calculate the extraction efficiency of spontaneous emission in a periodically corrugated layer structure. This general model has been applied to a GA-RCLED emitting at 980 nm. The structure consisting of a hybrid bottom-emitting cavity with metallic grating and bottom DBR mirror, shows simulated efficiencies of over 40%. Electrically pumped devices have been processed. Experimental data and simulation results, such as polarization selective emission, spectral behavior and efficiency are compared and discussed.

Paper Details

Date Published: 6 June 2002
PDF: 8 pages
Proc. SPIE 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI, (6 June 2002); doi: 10.1117/12.469215
Show Author Affiliations
Danae Delbeke, Ghent Univ. (Belgium)
Carl Sys, Ghent Univ. (Belgium)
Ingrid Moerman, Ghent Univ. (Belgium)
Peter Van Daele, Ghent Univ. (Belgium)
Roel G. Baets, Ghent Univ. (Belgium)

Published in SPIE Proceedings Vol. 4641:
Light-Emitting Diodes: Research, Manufacturing, and Applications VI
E. Fred Schubert; H. Walter Yao, Editor(s)

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