3D electrothermal simulations of organic LEDs showing negative differential resistance

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Date
2017
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Volume Title
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Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik
Abstract

Organic semiconductor devices show a pronounced interplay between temperature-activated conductivity and self-heating which in particular causes inhomogeneities in the brightness of large-area OLEDs at high power. We consider a 3D thermistor model based on partial differential equations for the electrothermal behavior of organic devices and introduce an extension to multiple layers with nonlinear conductivity laws, which also take the diode-like behavior in recombination zones into account. We present a numerical simulation study for a red OLED using a finite-volume approximation of this model. The appearance of S-shaped current-voltage characteristics with regions of negative differential resistance in a measured device can be quantitatively reproduced. Furthermore, this simulation study reveals a propagation of spatial zones of negative differential resistance in the electron and hole transport layers toward the contact.

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Keywords
Organic semiconductors, self-heating, negative differential resistance, p-Laplacian, thermistor model, hybrid finite-volume/finite-element scheme
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Citation
Liero, M., Fuhrmann, J., Glitzky, A., Koprucki, T., Fischer, A., & Reineke, S. (2017). 3D electrothermal simulations of organic LEDs showing negative differential resistance (Version publishedVersion, Vol. 2420). Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik. https://doi.org//10.20347/WIAS.PREPRINT.2420
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