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Proceedings Paper

(AlGaIn)N ultraviolet LED chips and their use in triphosphor luminescence conversion white LEDs
Author(s): Joachim Wagner; Ulrich Kaufmann; Klaus Koehler; Michael Kunzer; Wilfried Pletschen; Harald Obloh; Peter Schlotter; Thilo Stephan; Herbert Walcher; Ard Ellens; Wolfgang Rossner; Manfred Kobusch
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Paper Abstract

We report on the development of (AlGaIn)N quantum well LEDs covering the 380 to 430 nm wavelength range, which serve as the primary light source for tri-phosphor luminescence conversion white LEDs. Epitaxial layer growth was performed by low-pressure metal-organic chemical vapor deposition on sapphire substrates. Mesa LEDs were fabricated and either mounted in standard epoxy-based 5 mm radial LED packages or flip-chip bonded on ceramic submounts. Then, LED-chips with peak wavelengths matching the absorption spectrum of an appropriately chosen inorganic tri-phosphor blend, were used for the fabrication of single-chip tri-color luminescence conversion white LEDs. These de-vices allowed us to demonstrate the feasibility of the above concept for improved color rendering and tunability.

Paper Details

Date Published: 6 June 2002
PDF: 10 pages
Proc. SPIE 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI, (6 June 2002); doi: 10.1117/12.469203
Show Author Affiliations
Joachim Wagner, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Ulrich Kaufmann, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Klaus Koehler, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Michael Kunzer, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Wilfried Pletschen, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Harald Obloh, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Peter Schlotter, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Thilo Stephan, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Herbert Walcher, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Ard Ellens, OSRAM Opto Semiconductors GmbH (Germany)
Wolfgang Rossner, Siemens AG (Germany)
Manfred Kobusch, Siemens AG (Germany)


Published in SPIE Proceedings Vol. 4641:
Light-Emitting Diodes: Research, Manufacturing, and Applications VI
E. Fred Schubert; H. Walter Yao, Editor(s)

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