Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.86: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Transfer mechanisms between emitter molecules for OLED applications — •Frank Steinbacher1,2, Chien-Shu Chiu3,2, Ralf Krause2, Arvid Hunze2, and Albrecht Winnacker1 — 1Department of Materials Science VI, University of Erlangen-Nuremberg, Germany — 2Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany — 3Department of Electrical Engineering & Information Technology, Technical University of Braunschweig, Germany
Within the last few years white organic light emitting diodes based on small molecules have shown the potential to have a promising future in the field of lighting technology. Nevertheless there is still room for improvement of the overall efficiency and lifetime of white OLEDs. A deeper understanding of the energy transfer mechanisms between different matrix and emitter molecules used in the OLED stack concept can help to optimize the layout and reduce driving voltage thus increasing the power efficiency and color stability of the device. To simplify the complex interactions within a complete white OLED we start out with a basic model system only containing the molecules of interest. This enables us to predict the fundamental concepts causing the behavior of more intricate systems. Using photoluminescence, excitation spectra and time-resolved photoluminescence we investigated the exciton transfer between different dyes for a variety of emitter systems. Our results indicate a dependence of exciton transfer probability on the total concentrations and therefore the distance between the molecules involved.