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Proceedings Paper

Recent results and latest views on microcavity LEDs
Author(s): Claude Weisbuch; Aurelien David; Tetsuo Fujii; C. Schwach; Steven P. DenBaars; Shuji Nakamura; M. Rattier; Henri Benisty; Romuald Houdré; R. Stanley; Jean-Francois Carlin; Thomas F. Krauss; Christopher J. M. Smith
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Paper Abstract

We are progressively approaching the physical limits of microcavity LEDs (MC-LEDs) for high brightness, high efficiency LEDs. They are promising high efficiency devices and they offer the very attractive prospect of full planar fabrication process. However, to compete with other high efficiency LED schemes, they need to approach or surpass the 50 % efficiency mark. We first explore the limits of planar MC-LEDs in both the GaAlInAsP and GaInAlN materials systems, and show that the single-step extraction limit is in the 40 % range at best, depending on the materials system used, with the largest part of the non-extracted light being emitted into guided modes. The waveguided light can itself be extracted by photon recycling, when the internal quantum efficiency is high. Otherwise, another extraction scheme for that light is provided by various photonic-crystal-assisted extraction schemes. Simple photonic crystals (PCs) appear to lack the omnidirectional extraction properties required. However, more rotation-invariant PCs like Archimedean tilings allow to obtain such extraction with added efficiencies already in the 10% range. We discuss the further improvements to such structures.

Paper Details

Date Published: 21 June 2004
PDF: 19 pages
Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, (21 June 2004); doi: 10.1117/12.537630
Show Author Affiliations
Claude Weisbuch, Univ. of California/Santa Barbara (United States)
Ecole Polytechnique (France)
Aurelien David, Univ. of California/Santa Barbara (United States)
Ecole Polytechnique (France)
Institute d'Optique (France)
Tetsuo Fujii, Univ. of California/Santa Barbara (United States)
C. Schwach, Univ. of California/Santa Barbara (United States)
Steven P. DenBaars, Univ. of California/Santa Barbara (United States)
Shuji Nakamura, Univ. of California/Santa Barbara (United States)
M. Rattier, Ecole Polytechnique (France)
Henri Benisty, Ecole Polytechnique (France)
Institut d'Optique (France)
Romuald Houdré, Ecole Polytechnique Federale de Lausanne (Switzerland)
R. Stanley, Ecole Polytechnique Federale de Lausanne (Switzerland)
Jean-Francois Carlin, Ecole Polytechnique Federale de Lausanne (Switzerland)
Thomas F. Krauss, St. Andrews Univ. (United Kingdom)
Christopher J. M. Smith, Intense Photonics Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 5366:
Light-Emitting Diodes: Research, Manufacturing, and Applications VIII
Steve A. Stockman; H. Walter Yao; E. Fred Schubert, Editor(s)

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