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Proceedings Paper

Resonant-cavity light-emitting diodes: a review
Author(s): Roel G. Baets; Danae G. Delbeke; Ronny Bockstaele; Peter Bienstman
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Paper Abstract

An overview of planar resonant-cavity light-emitting diodes is presented. Letting spontaneous emission happen in a planar cavity will in the first place affect the extraction efficiency. The internal intensity distribution is not longer isotropic due to interference effects (or density of states effects). The basics of dipole emission in planar cavities will be shortly reviewed using a classical approach valid in the so called weak-coupling regime. The total emission enhancement or Purcell factor, although small in planar cavities, will be explained. The design of a GaAs/AlGaAs RCLED is discussed. We review the state-of-the-art devices in different semiconductor material systems and at different wavelengths. Some advanced techniques based on gratings or photonic crystals to improve the efficiency of these devices are discussed. RCLEDs are not the only candidates that can be used as high-efficiency light sources in communication and non-communication applications. They compete with other high-efficiency LEDs and with VCSELs. The future prospects of RCLEDs are discussed in view of this competition.

Paper Details

Date Published: 3 July 2003
PDF: 13 pages
Proc. SPIE 4996, Light-Emitting Diodes: Research, Manufacturing, and Applications VII, (3 July 2003); doi: 10.1117/12.476588
Show Author Affiliations
Roel G. Baets, Ghent Univ. (Belgium)
Danae G. Delbeke, Ghent Univ. (Belgium)
Ronny Bockstaele, Ghent Univ. (Belgium)
Peter Bienstman, Ghent Univ. (Belgium)

Published in SPIE Proceedings Vol. 4996:
Light-Emitting Diodes: Research, Manufacturing, and Applications VII
E. Fred Schubert; Kurt J. Linden; H. Walter Yao; Daniel J. McGraw, Editor(s)

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