OLEDs: light-emitting thin film thermistors revealing advanced self-heating effects | Zendy

Axel Fischer | Zendy; Thomas Koprucki | Zendy; Annegret Glitzky | Zendy; Matthias Liero | Zendy; Klaus Gärtner | Zendy; Jacqueline Hauptmann | Zendy; Sebastian Reineke | Zendy; Daniel Kasemann | Zendy; Björn Lüssem | Zendy; Karl Leo | Zendy; Reinhard Scholz | Zendy

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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

Publication year - 2015

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.2186940

Subject(s) - oled , brightness , luminance , homogeneity (statistics) , joule heating , materials science , optoelectronics , flat panel , thermistor , light emitting diode , flat panel display , computer science , optics , electrical engineering , nanotechnology , physics , composite material , computer graphics (images) , computer vision , engineering , layer (electronics) , machine learning

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

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