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Proceedings Paper

Ultraviolet nitride LED fabrication for high-flux white LED
Author(s): Hari S. Venugopalan; Anthony DiCarlo; Xiang Gao; Sebastien Libon; Bryan S. Shelton; Emil Stefanov; Tingting Zhang; Ivan Eliashevich; Stan E. Weaver; Michael Hsing; Boris Kolodin; Tom Soules; Doru Florescu; Shiping Guo; Milan Pophristic; Boris Peres
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Paper Abstract

The requirements for maximizing the external quantum efficiency of UV nitride LEDs are discussed. It is shown that as the chip wavelength progressively decreases, nitride epi growth on a sapphire substrate becomes advantageous in terms of light extraction. The epilayer requirements for UV LEDs dictate the growth of n-AlGaN, with increasing Al contents, and the growth of UV-transparent p-GaN. It is shown that MOCVD growth in a Emcore D-180 or Ganzilla reactor is ideal for meeting the stringent epilayer requirements. Increasing light extraction efficiency and wall-plug efficiency also requires optimization of the reflecting P-contact. The relative merits of Al- and Ag-based reflecting contacts are discussed. Performance data for UV LEDs on sapphire, for drive currents up to 700 mA is shown. Finally, a practical high power UV-based white lamp is demonstrated.

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: 10.1117/12.486359
Show Author Affiliations
Hari S. Venugopalan, GELcore LLC (United States)
Anthony DiCarlo, GELcore LLC (United States)
Xiang Gao, GELcore LLC (United States)
Sebastien Libon, GELcore LLC (United States)
Bryan S. Shelton, GELcore LLC (United States)
Emil Stefanov, GELcore LLC (United States)
Tingting Zhang, GELcore LLC (United States)
Ivan Eliashevich, GELcore LLC (United States)
Stan E. Weaver, GE Global Research Ctr. (United States)
Michael Hsing, GELcore LLC (United States)
Boris Kolodin, GELcore LLC (United States)
Tom Soules, GELcore LLC (United States)
Doru Florescu, EMCORE Corp. (United States)
Shiping Guo, EMCORE Corp. (United States)
Milan Pophristic, EMCORE Corp. (United States)
Boris Peres, EMCORE Corp. (United States)

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

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