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Proceedings Paper

Efficient light-emitting diodes with radial outcoupling taper at 980- and 630-nm emission wavelength
Author(s): Wolfgang Schmid; Marcus Scherer; Roland Jaeger; Peter Stauss; Klaus P. Streubel; Karl Joachim Ebeling
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Paper Abstract

We have investigated efficient light outcoupling from light- emitting diodes (LEDs) by introducing lateral tapers. The concept is based on light generation in the very central area of a circularly symmetric structure. After propagating between two highly reflecting mirrors light is outcoupled in a tapered mesa region. By proper processing we achieve quantum efficiencies of almost 40% for outcoupling via a planar surface or quantum and wallplug efficiencies of 52% and 48%, respectively, for encapsulated devices. Neglecting reabsorption, approximative equations yield optimum design parameters.

Paper Details

Date Published: 14 May 2001
PDF: 10 pages
Proc. SPIE 4278, Light-Emitting Diodes: Research, Manufacturing, and Applications V, (14 May 2001); doi: 10.1117/12.426839
Show Author Affiliations
Wolfgang Schmid, OSRAM Opto Semiconductors (Germany)
Marcus Scherer, Univ. Ulm (Germany)
Roland Jaeger, Univ. Ulm (Germany)
Peter Stauss, OSRAM Opto Semiconductors (Germany)
Klaus P. Streubel, OSRAM Opto Semiconductors (Germany)
Karl Joachim Ebeling, Infineon Technologies AG (Germany)

Published in SPIE Proceedings Vol. 4278:
Light-Emitting Diodes: Research, Manufacturing, and Applications V
H. Walter Yao; E. Fred Schubert, Editor(s)

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