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Proceedings Article

Recent results and latest views on microcavity LEDs

[+] Author Affiliations
Claude Weisbuch

Univ. of California/Santa Barbara (USA) and Ecole Polytechnique (France)

Aurelien David

Univ. of California/Santa Barbara (USA) and Ecole Polytechnique (France) and Institute d'Optique (France)

Tetsuo Fujii, C. Schwach, Steven P. DenBaars, Shuji Nakamura

Univ. of California/Santa Barbara (USA)

M. Rattier

Ecole Polytechnique (France)

Henri Benisty

Ecole Polytechnique (France) and Institut d'Optique (France)

Romuald Houdr‰, R. Stanley, 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)

Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, 1 (June 21, 2004); doi:10.1117/12.537630
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From Conference Volume 5366

  • Light-Emitting Diodes: Research, Manufacturing, and Applications VIII
  • Steve A. Stockman; H. Walter Yao; E. Fred Schubert
  • San Jose, CA, United States | January 26, 2004

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.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Claude Weisbuch ; Aurelien David ; Tetsuo Fujii ; C. Schwach ; Steven P. DenBaars, et al.
"Recent results and latest views on microcavity LEDs", Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, 1 (June 21, 2004); doi:10.1117/12.537630; http://dx.doi.org/10.1117/12.537630


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