Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.65: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Simulation of Phosphorescent Organic Light Emitting Diodes — •Oliver Weiß1,2, Fryderyk Kozlowski2, Arvid Hunze2, and Heinz von Seggern1 — 1Department of Materials Science, Technical University of Darmstadt, Germany — 2Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
Numerical Simulation has proven to be a valuable tool for the qualitative and quantitative description of fluorescent 3- and 4-layer OLED devices. Since actual high efficient SM-OLED stacks comprise of wide band gap host materials doped by phosphorescent guest molecules, the simulation model was extended to phosphorescence. The one-dimensional model differentiates between singlet and triplet states on host and guest molecules. Triplets on the host are formed by the recombination of free charges, triplets on the guest via transfer from the host, trap recombination and intersystem crossing from singlet states. Rate equations describe exciton diffusion as well as radiative decay, using different diffusion lengths and time constants for every guest material. Triplet-triplet annihilation and triplet-polaron quenching were implemented using rate equations published by M. Baldo . The results of simulating a simple high efficient phosphorescent OLED stack are presented in comparison to experimental data.
This work has been supported by the German Federal Ministry of Education and Research (BMBF) within the framework of the OPAL project.