Title: High power light-emitting diode junction temperature determination from current-voltage characteristics
Authors: Keppens, Arno ×
Ryckaert, Wouter
Deconinck, Geert
Hanselaer, Peter #
Issue Date: 4-Nov-2008
Publisher: American Institute of Physics
Series Title: Journal of Applied Physics vol:104 issue:9 pages:8p
Article number: JR08-2875R
Abstract: Optical and electrical characteristics of power light-emitting diodes (LEDs) are strongly dependent on the diode junction temperature. However, direct junction temperature determination is not possible and alternative methods must be developed. Current-voltage characteristics of commercial
high power LEDs have been measured at six different temperatures ranging between 295 and 400 K. Modeling these characteristics, including variation in the bandgap with temperature, revealed a linear temperature dependence of the forward voltage if the drive current is chosen within a rather limited current range. Theoretically, the voltage intercept can be deduced from the bulk semiconductor bandgap. However, accurate junction temperature determination is only possible if at least two calibration measurements at a particular drive current are performed. The method described in this paper can be applied to calculate the thermal resistance from the junction to any
other reference point for any particular LED configuration.
ISSN: 0021-8979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - ELECTA, Electrical Energy Computer Architectures
Technologiecluster ESAT Elektrotechnische Engineering
Electrical Engineering (ESAT) TC, Technology Campuses Ghent and Aalst
× corresponding author
# (joint) last author

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