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Red and Near Infrared Microcavity Light-Emitting Diodes
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Lighting is essential to modern society but it§accounts for nearly 20 % of the electrical energy§usage. Thus efforts to increase the conversion§efficiencies of light sources are attracting more and§more attention. Potential high efficiency light§sources are fluorescent lamps or light-emitting§diodes (LEDs). Modern LEDs show internal quantum§efficiencies of virtually 100 %. However, in the case§of standard LEDs most of this light is trapped inside§the device because of total internal reflection at§the interface semiconductor-air. Several methods have§been developed in order to increase the extraction§efficiency. This can be done either by optimizing the§device geometry in order to increase the escape cone§or by incorporating a resonant structure in order to§force the internal emission into the existing escape§cone. The latter approach is called microcavity LED§(MCLED) or resonant cavity LED (RCLED) and is§presented in detail in this work. Novel concepts to§further increase the external quantum efficiency are§discussed and experimental results are presented.
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