14 April 1999 16.8% external quantum efficiency from a planar LED
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Abstract
Efficient, cheap, and simple, LEDs are used in many applications and make up the bulk of the opto-electronic component market. Due to the small critical angle at the semiconductor-air interface, relatively little light escapes per facet. The conventional route is to collect light from all six facets and redirect it, using external reflectors into a useful direction. While this increases external quantum efficiency it does little to increase brightness. In the last few years the microcavity approach has been used to persuade the light to leave by just one facet, thus increasing the brightness considerably. Although remarkable efficiencies have been achieved, microcavity LEDs (MCLEDs) have yet to surpass conventional LEDs. We present here a single mirror LED, grown by MBE, which falls between the conventional LED and the planar MCLED.
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Christian Dill, Ross P. Stanley, Ursula Oesterle, Marc Ilegems, "16.8% external quantum efficiency from a planar LED", Proc. SPIE 3621, Light-Emitting Diodes: Research, Manufacturing, and Applications III, (14 April 1999); doi: 10.1117/12.344475; https://doi.org/10.1117/12.344475
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