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Proceedings Paper

Scalability of buried microreflector light-emitting diodes for high-current applications
Author(s): Stefan Illek; Ines Pietzonka; Andreas Ploessl; Peter Stauss; Walter Wegleiter; Reiner Windisch; Ralph Wirth; Heribert Zull; Klaus P. Streubel
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Paper Abstract

The combination of wafer soldering using metal layers and the introduction of buried micro-reflector structures has proven to be a promising approach to fabricate high brightness, substrate-less LEDs in the AlGaInP material system. In addition to the enhanced light output, the scalability of this approach has been predicted as a major advantage. In contrast to other approaches, larger area LEDs can be fabricated without altering the epitaxial structure and thickness of layers simply by offering a larger area for light generation. First samples of amber (λ = 615 nm) buried micro-reflector LEDs with side-length up to 1000 μm have been realized. Devices mounted in packages with improved heat sinks are capable of low voltage CW operation with currents as high as 600 mA (Vfw≤ 2,8 V) without significant thermal flattening of the light-current characteristics. The maximum luminous flux achieved at these oeprating conditions is 46 lumen. Already these first experiments demonstrate the potential of the concept of buried micro-reflector LEDs not only for high-brightness but also for high-current operation. The results are among the best values of high-flux LEDs in this wavelength range.

Paper Details

Date Published: 3 July 2003
PDF: 8 pages
Proc. SPIE 4996, Light-Emitting Diodes: Research, Manufacturing, and Applications VII, (3 July 2003); doi: 10.1117/12.476550
Show Author Affiliations
Stefan Illek, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Ines Pietzonka, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Andreas Ploessl, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Peter Stauss, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Walter Wegleiter, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Reiner Windisch, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Ralph Wirth, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Heribert Zull, OSRAM Opto Semiconductors GmbH & Co. (Germany)
Klaus P. Streubel, OSRAM Opto Semiconductors GmbH & Co. (Germany)


Published in SPIE Proceedings Vol. 4996:
Light-Emitting Diodes: Research, Manufacturing, and Applications VII
E. Fred Schubert; H. Walter Yao; Kurt J. Linden; Daniel J. McGraw, Editor(s)

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