Modeling and simulation of electrothermal feedback in large-area organic LEDs

We present an empirical PDE model for the description of the interplay between total current and heat flow in large-area organic LEDs, which can lead to unwanted spatial brightness in homogeneities. The model resolves the different layers in the OLED stack by taking their individual IV characteristi...

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Bibliographic Details
Published in:	2017 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) pp. 105 - 106
Main Authors:	Liero, M., Fuhrmann, J., Glitzky, A., Koprucki, T., Fischer, A., Reineke, S.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-07-2017
Subjects:	Conductivity Heating systems Mathematical model Nonhomogeneous media Numerical models Organic light emitting diodes Thermistors
Online Access:	Get full text
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Summary:	We present an empirical PDE model for the description of the interplay between total current and heat flow in large-area organic LEDs, which can lead to unwanted spatial brightness in homogeneities. The model resolves the different layers in the OLED stack by taking their individual IV characteristics into account. In particular, the electrical conductivity features a field dependence to incorporate the non-Ohmic behavior of the organic materials and a temperature dependence via an Arrhenius law. We discuss the numerical scheme and present simulation results that confirm the experimentally observed S-shaped IV characteristics with regions of negative differential resistance, which cause the inhomogeneities.
ISSN:	2158-3242
DOI:	10.1109/NUSOD.2017.8010013