Title
Optical determination of the junction temperature of OLEDs Optical determination of the junction temperature of OLEDs
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Physics
Source (journal)
Organic electronics: physics, materials, applications. - London
Volume/pages
14(2013) :11 , p. 2770-2776
ISSN
1566-1199
ISI
000325487000009
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
This paper describes a novel optical measurement technique for the in situ determination of the spatial temperature distribution at the organic layer level in large-area organic light-emitting diodes (OLEDs). The local junction temperature of OLEDs is a very important factor with respect to the luminance uniformity. Moreover the variation of local temperatures leads to a non-uniform depreciation of its light output, which in turn increases the luminance non-uniformity over time and affects the lifetime expectancy of the OLED. Junction temperature maps can be derived from easily measurable luminance maps after a dedicated calibration procedure. The underlying model based on the relationship between the local diode electrical behavior and the light emission at different temperatures. The method is illustrated for the self-heating of a commercially available OLED for lighting, and validated by comparison with infrared thermography.
E-info
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