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10 March 2020 Light extraction from LEDs: a long battle (Conference Presentation)
Claude Weisbuch, Leah Kuritzky, James S. Speck
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Proceedings Volume 11280, Gallium Nitride Materials and Devices XV; 112800N (2020) https://doi.org/10.1117/12.2543070
Event: SPIE OPTO, 2020, San Francisco, California, United States
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
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Claude Weisbuch, Leah Kuritzky, and James S. Speck "Light extraction from LEDs: a long battle (Conference Presentation)", Proc. SPIE 11280, Gallium Nitride Materials and Devices XV, 112800N (10 March 2020); https://doi.org/10.1117/12.2543070
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KEYWORDS
Light emitting diodes
Interfaces
Heterojunctions
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