Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.43: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Numerical Simulation of Multilayer Organic Light Emitting Diodes — •Oliver Weiß1,2, Carsten Tschamber3,2, Christoph Gärditz3,2, Dirk Buchhauser4,2, Arvid Hunze2, Joachim Wecker2, and Heinz von Seggern1 — 1Dept. Materials Science, Technical University of Darmstadt, Germany — 2Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany — 3Dept. Materials Science VI, University of Erlangen-Nuremberg, Germany — 4Dept. Experimental Physics, University of Freiberg, Germany
Modelling of OLED devices helps understanding the corresponding physics and accelerates the development of stable and efficient organic stacks. A one-dimensional numerical model for the quantitative simulation of multilayer OLEDs was introduced by Staudigel. It includes amongst others charge carrier drift and diffusion, trapping, recombination, singlet exciton diffusion and quenching. The simulation program being developed at Siemens CT MM 1 is based on Staudigels work. The model is extended to handle an arbitrary number of organic layers and was further improved in numerous points. For low injection barriers, ohmic contacts are assumed and charge carriers drift from the electrodes to the organic monolayers driven by the electric field. For barriers higher than 0.3 eV a thermionic injection mechanism was implemented. Analytical solutions of a simple monolayer device including one discrete trap level are reproduced over several orders of magnitude by numerical simulation using the same set of input parameters. The presented results of modelling an efficient organic stack demonstrate the simulation tool’s ability of characterising up-to-date multilayer OLEDs.