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Optical and Quantum Electronics

3D electrothermal simulations of organic LEDs showing negative differential resistance

  • 01-10-2017
Published in:
Authors
Matthias Liero
Jürgen Fuhrmann
Annegret Glitzky
Thomas Koprucki
Axel Fischer
Sebastian Reineke
Published in
Optical and Quantum Electronics | Issue 10/2017

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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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previous article Internal power loss in GaN-based lasers: mechanisms and remedies
next article Efficient coupling of the inhomogeneous current spreading model to the dynamic electro-optical solver for broad-area edge-emitting semiconductor devices
Title
3D electrothermal simulations of organic LEDs showing negative differential resistance
Authors
Matthias Liero
Jürgen Fuhrmann
Annegret Glitzky
Thomas Koprucki
Axel Fischer
Sebastian Reineke
Publication date
01-10-2017
Publisher
Springer US
Published in
Optical and Quantum Electronics / Issue 10/2017
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI
https://doi.org/10.1007/s11082-017-1167-4
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