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Proceedings Paper

Characterization of thermal resistance coefficient of high-power LEDs
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Paper Abstract

Heat at the junction of light-emitting diodes (LED) affects the overall performance of the LED in terms of light output, spectrum, and life. Usually it is difficult to measure junction temperature of a LED directly. There are several techniques for estimating LED junction temperature. One-dimensional heat transfer analysis is one of the most popular methods for estimating the junction temperature. However, this method requires accurate knowledge of the thermal resistance coefficient from the junction to the board or pin. An experimental study was conducted to investigate what factors affected the thermal resistance coefficient from the junction to the board of high-power LED. Results showed that the thermal resistance coefficient changed as a function of ambient temperature, power dissipation at the junction, the amount of heat sink attached to the LED, and the orientation of the LED with the heat sink. This creates a challenge for using onedimensional heat transfer analysis to estimate junction temperature of LEDs once incorporated into a lighting system. However, it was observed that junction temperature and board temperature maintains a linear relationship if the power dissipation at the junction is held constant.

Paper Details

Date Published: 12 September 2006
PDF: 10 pages
Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 63370V (12 September 2006); doi: 10.1117/12.682585
Show Author Affiliations
Lalith Jayasinghe, Rensselaer Polytechnic Institute (United States)
Yimin Gu, Rensselaer Polytechnic Institute (United States)
Nadarajah Narendran, Rensselaer Polytechnic Institute (United States)

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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