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Proceedings Paper

Light extraction from LEDs: a long battle (Conference Presentation)
Author(s): Claude Weisbuch; Leah Kuritzky; James S. Speck

Paper Abstract

Light extraction of internally generated light in LEDs into air has always been a major issue from the early days. The reabsorption of emitted light, long a stumbling block, is now almost always solved by the use of heterostructures. The majority of the internal light undergoes total internal reflection at the materials/air interface due to the large index mismatch. This is mitigated by redirecting light rays by light diffusing/scattering structures situated at interfaces. Powerful simulation techniques exist taking into account the various physical mechanisms into play. The frontier is reaching 95%+ extraction efficiencies which would allow 100%+ LED wall-plug efficiencies

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11280, Gallium Nitride Materials and Devices XV, 112800N (10 March 2020); doi: 10.1117/12.2543070
Show Author Affiliations
Claude Weisbuch, Univ. of California, Santa Barbara (United States)
Leah Kuritzky, Univ. of California, Santa Barbara (United States)
James S. Speck, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 11280:
Gallium Nitride Materials and Devices XV
Hiroshi Fujioka; Hadis Morkoç; Ulrich T. Schwarz, Editor(s)

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