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Proceedings Paper

Performance characteristics of white light sources consisting of multiple light-emitting diodes
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Paper Abstract

The performance characteristics of white light sources based on a multiple-LED approach, in particular dichromatic and trichromatic sources are analyzed in detail. Figures of merit such as the luminous efficacy, color temperature, and color rendering capabilities are provided for a wide range of primary emission wavelengths. Spectral power density functions of LEDs are assumed to be thermally and inhomogeneously broadened to a full width at half maximum of several kT, in agreement with experimental results. A gaussian line shape is assumed for each of the emission bands. It is shown that multi-LED white light sources have the potential for luminous efficacies greater than 400 lm/W (dichromatic source) and color rendering indices of greater than 90 (trichromatic source). Contour maps for the color rendering indices and luminous efficacies versus three wavelengths are given.

Paper Details

Date Published: 26 January 2004
PDF: 7 pages
Proc. SPIE 5187, Third International Conference on Solid State Lighting, (26 January 2004); doi: 10.1117/12.512529
Show Author Affiliations
Yun-Li Li, Rensselaer Polytechnic Institute (United States)
Jay M. Shah, Rensselaer Polytechnic Institute (United States)
P.-H. Leung, Rensselaer Polytechnic Institute (United States)
Thomas Gessmann, Rensselaer Polytechnic Institute (United States)
E. F. Schubert, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 5187:
Third International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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