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Title
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Optical determination of the junction temperature of OLEDs
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Organic electronics: physics, materials, applications. - London
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Publication
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London
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2013
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ISSN
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1566-1199
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DOI
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10.1016/J.ORGEL.2013.07.032
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Volume/pages
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14
:11
(2013)
, p. 2770-2776
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ISI
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000325487000009
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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