22 September 2015 OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects
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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.
Conference Presentation
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Axel Fischer, Axel Fischer, Thomas Koprucki, Thomas Koprucki, Annegret Glitzky, Annegret Glitzky, Matthias Liero, Matthias Liero, Klaus Gärtner, Klaus Gärtner, Jacqueline Hauptmann, Jacqueline Hauptmann, Sebastian Reineke, Sebastian Reineke, Daniel Kasemann, Daniel Kasemann, Björn Lüssem, Björn Lüssem, Karl Leo, Karl Leo, Reinhard Scholz, Reinhard Scholz, } "OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95661A (22 September 2015); doi: 10.1117/12.2186940; https://doi.org/10.1117/12.2186940
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