3D electrothermal simulations of organic LEDs showing negative differential resistance |
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Authors: | Matthias Liero,Jürgen Fuhrmann,Annegret Glitzky,Thomas Koprucki author-information" >,Axel Fischer,Sebastian Reineke |
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Affiliation: | 1.Weierstrass Institute (WIAS),Berlin,Germany;2.Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), TU Dresden,Dresden,Germany |
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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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