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Proceedings Paper

High-power truncated-inverted-pyramid (AlxGa1-x)0.5In0.5P light-emitting diodes
Author(s): Mari Ochiai-Holcomb; Michael R. Krames; Gloria E. Hofler; Carrie Carter-Coman; Eugene I. Chen; Patrick N. Grillot; Kwang Park; Nathan F. Gardner; Jen-Wu Huang; Jason Posselt; David Collins; Steve A. Stockman; M. George Craford; Frederick A. Kish; I. Hsing Tan; Tun S. Tan; Christophe P. Kocot; Mark Hueschen
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Paper Abstract

High power light emitting diodes (LEDs) are of interest for many lighting applications. Flux improvements can be achieved by scaling conventional chips to larger dimensions. However this scaling results in a decrease in extraction efficiency. These penalties can be offset by modifying the chip geometry such that the number of internal reflections is reduced, thereby increasing the probability of photon escape. LEDs with a truncated-inverted-pyramid (TIP) geometry have been fabricated and packaged. Peak efficiencies exceeding 100 lm/W have been measured (100 mA dc, 300 K) for orange ((lambda) p approximately 610 m) devices. In the red wavelength regime ((lambda) p approximately 650 nm), peak external quantum efficiencies of 55% (100 mA dc, 300 K) have been achieved. Flux exceeding 65 lumens from a single 594 nm device has also been demonstrated. These characteristics match and/or exceed the performance of many conventional lighting sources.

Paper Details

Date Published: 17 April 2000
PDF: 5 pages
Proc. SPIE 3938, Light-Emitting Diodes: Research, Manufacturing, and Applications IV, (17 April 2000); doi: 10.1117/12.382843
Show Author Affiliations
Mari Ochiai-Holcomb, LumiLeds Lighting (United States)
Michael R. Krames, LumiLeds Lighting (United States)
Gloria E. Hofler, LumiLeds Lighting (United States)
Carrie Carter-Coman, LumiLeds Lighting (United States)
Eugene I. Chen, LumiLeds Lighting (United States)
Patrick N. Grillot, LumiLeds Lighting (United States)
Kwang Park, LumiLeds Lighting (United States)
Nathan F. Gardner, LumiLeds Lighting (United States)
Jen-Wu Huang, LumiLeds Lighting (United States)
Jason Posselt, LumiLeds Lighting (United States)
David Collins, LumiLeds Lighting (United States)
Steve A. Stockman, LumiLeds Lighting (United States)
M. George Craford, LumiLeds Lighting (United States)
Frederick A. Kish, Agilent Technologies (United States)
I. Hsing Tan, Agilent Technologies (United States)
Tun S. Tan, Agilent Technologies (United States)
Christophe P. Kocot, Agilent Technologies (United States)
Mark Hueschen, Agilent Technologies (United States)


Published in SPIE Proceedings Vol. 3938:
Light-Emitting Diodes: Research, Manufacturing, and Applications IV
H. Walter Yao; Ian T. Ferguson; E. Fred Schubert, Editor(s)

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