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Proceedings Paper

InGaAlP thin film LEDs with high luminous efficiency
Author(s): Reiner Windisch; Paola Altieri; Rainer Butendeich; Stefan Illek; Peter Stauss; Wilhelm Stein; Walter Wegleiter; Ralph Wirth; Heribert Zull; Klaus P. Streubel
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Paper Abstract

In Thinfilm LEDs, the substrate absorption of the generated light is avoided by a metal reflector between the light emitting layer and the substrate. The light extraction can be further enhanced by buried microreflectors or surface texturing. We demonstrate that the combination of these technologies gives prospects equal or superior to all other known approaches in terms of luminous efficiency and luminance. At a peak wavelength of 617 nm, we have obtained a luminous efficiency of 95.7 lm/W at 20 mA. We further analyze the internal and light extration efficiencies of our LEDs using raytracing simulations as well as a theoretical model for the internal efficiency. This analysis shows quantitatively that the efficient light extraction from InGaAlP thinfilm LEDs becomes more and more difficult when approaching shorter wavelengths.

Paper Details

Date Published: 21 June 2004
PDF: 10 pages
Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, (21 June 2004); doi: 10.1117/12.528938
Show Author Affiliations
Reiner Windisch, OSRAM Opto Semiconductors GmbH (Germany)
Paola Altieri, OSRAM Opto Semiconductors GmbH (Germany)
Rainer Butendeich, OSRAM Opto Semiconductors GmbH (Germany)
Stefan Illek, OSRAM Opto Semiconductors GmbH (Germany)
Peter Stauss, OSRAM Opto Semiconductors GmbH (Germany)
Wilhelm Stein, OSRAM Opto Semiconductors GmbH (Germany)
Walter Wegleiter, OSRAM Opto Semiconductors GmbH (Germany)
Ralph Wirth, OSRAM Opto Semiconductors GmbH (Germany)
Heribert Zull, OSRAM Opto Semiconductors GmbH (Germany)
Klaus P. Streubel, OSRAM Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 5366:
Light-Emitting Diodes: Research, Manufacturing, and Applications VIII
Steve A. Stockman; H. Walter Yao; E. Fred Schubert, Editor(s)

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