Is the thermal resistance coefficient of high-power LEDs constant?

Lalith Jayasinghe; Tianming Dong; Nadarajah Narendran

doi:10.1117/12.738739

17 September 2007 Is the thermal resistance coefficient of high-power LEDs constant?

Lalith Jayasinghe, Tianming Dong, Nadarajah Narendran

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 666911 (2007) https://doi.org/10.1117/12.738739
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

In this paper, we discuss the variations of thermal resistance coefficient from junction to board (Rθ_jb) 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 Rθ_jb at different input power levels and ambient temperatures. Experimental results show that Rθ_jb 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, Rθ_jb increased but not as much as what was observed with drive current increase.

Citation Download Citation

Lalith Jayasinghe, Tianming Dong, and Nadarajah Narendran "Is the thermal resistance coefficient of high-power LEDs constant?", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666911 (17 September 2007); https://doi.org/10.1117/12.738739

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