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Proceedings Paper

Design optimization and experimental verification of white-light-emitting diodes using multiple phosphor films
Author(s): Dunyen Kan; Enboa Wu; Da-ming Wang
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Paper Abstract

White light-emitting-diodes (LEDs) are known as a new generation lighting source. Using a blue LED with a phosphor layer which is excited by blue light and down-converting to the second light, such as yellow light, white light can be produced. Using a one-dimensional mathematical model, we can describe the light propagation by simple absorption, conversion, and reflection terms. We use a multiple phosphor film coating method to determine the coefficient of the model, followed by analysis to determine the optimum phosphor layer LED package. With a phosphor layer plus a yellow light reflector, the white light extraction efficiency could be above 0.9 relative the conventional package's 0.6- 0.8.

Paper Details

Date Published: 12 September 2006
PDF: 8 pages
Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 63370H (12 September 2006); doi: 10.1117/12.675679
Show Author Affiliations
Dunyen Kan, National Taiwan Univ. (Taiwan)
Enboa Wu, Hong Kong Applied Science and Technology Research Institute (Hong Kong China)
Da-ming Wang, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6337:
Sixth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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