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Proceedings Paper

Is the thermal resistance coefficient of high-power LEDs constant?
Author(s): Lalith Jayasinghe; Tianming Dong; Nadarajah Narendran
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Paper Abstract

In this paper, we discuss the variations of thermal resistance coefficient from junction to board (Rθjb) for high-power light-emitting diodes (LEDs) as a result of changes in power dissipation and ambient temperature. Three-watt white and blue LED packages from the same manufacturer were tested for Rθjb at different input power levels and ambient temperatures. Experimental results show that Rθjb increases with increased input power for both LED packages, which can be attributed to current crowding mostly and some to the conductivity changes of GaN and TIM materials caused by heat rise. With increasing ambient temperature, Rθjb increased but not as much as what was observed with drive current increase.

Paper Details

Date Published: 17 September 2007
PDF: 6 pages
Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666911 (17 September 2007); doi: 10.1117/12.738739
Show Author Affiliations
Lalith Jayasinghe, Rensselaer Polytechnic Institute (United States)
Tianming Dong, Rensselaer Polytechnic Institute (United States)
Nadarajah Narendran, Rensselaer Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 6669:
Seventh International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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