Author
Arık, Mehmet, Kulkarni, K. S., Royce, C., Weaver, S.
Publication Date
2014
Subject
LED junction temperature, Forward voltage, Wavelength shift, Thermal transient behavior
Type
Document
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1087-9870
Record ID
389990fd-90cc-4f7d-8abb-000c29f92be6
Library Location
Mechanical Engineering
Date
2014
Notes
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text
White light emitting diodes (LEDs) are appearing in general illumination applications. Clusters of such LEDs can replace an incandescent light bulb of equal luminosity on the merit of considerably low power consumption. However the optical performance and working life of these LED packages are strongly dependent on the temperature of the p-n junction of the LED. Hence it is very critical to determine the temperature of the junction. Three methods - forward voltage change, peak wavelength shift and infrared thermal imaging are employed to determine the junction temperature. Forward voltage change method is found to be the most accurate method (± 3 °C) for an optimized set of parameters. Analytical model is proposed for the thermal transient behavior of the LED junction and the predictions are compared with experimental results. A good agreement is observed between that of two experimental methods. Thermal resistance of the LED package is estimated analytically and experimentally. Experimental values show a larger variation than expected through material property variation.
DOI
10.1109/ITHERM.2014.6892277
