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Proceedings Paper

OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects
Author(s): Axel Fischer; Thomas Koprucki; Annegret Glitzky; Matthias Liero; Klaus Gärtner; Jacqueline Hauptmann; Sebastian Reineke; Daniel Kasemann; Björn Lüssem; Karl Leo; Reinhard Scholz
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Paper Abstract

Large area OLEDs show pronounced Joule self-heating at high brightness. This heating induces brightness inhomogeneities, drastically increasing beyond a certain current level. We discuss this behavior considering 'S'-shaped negative differential resistance upon self-heating, even allowing for 'switched-back' regions where the luminance finally decreases (Fischer et al., Adv. Funct. Mater. 2014, 24, 3367). By using a multi-physics simulation the device characteristics can be modeled, resulting in a comprehensive understanding of the problem. Here, we present results for an OLED lighting panel considered for commercial application. It turns out that the strong electrothermal feedback in OLEDs prevents high luminance combined with a high degree of homogeneity unless new optimization strategies are considered.

Paper Details

Date Published: 22 September 2015
PDF: 7 pages
Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95661A (22 September 2015); doi: 10.1117/12.2186940
Show Author Affiliations
Axel Fischer, TU Dresden (Germany)
Thomas Koprucki, Weierstraß-Institut (Germany)
Annegret Glitzky, Weierstraß-Institut (Germany)
Matthias Liero, Weierstraß-Institut (Germany)
Klaus Gärtner, Univ. della Svizzera italiana (Switzerland)
Jacqueline Hauptmann, Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP (Germany)
Sebastian Reineke, TU Dresden (Germany)
Daniel Kasemann, TU Dresden (Germany)
Björn Lüssem, TU Dresden (Germany)
Kent State Univ. (United States)
Karl Leo, TU Dresden (Germany)
Reinhard Scholz, TU Dresden (Germany)

Published in SPIE Proceedings Vol. 9566:
Organic Light Emitting Materials and Devices XIX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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