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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.10: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Charge Transport in Organic LEDs — •Carsten Tschamber¹, Wiebke Sarfert¹, Dirk Buchhauser², Christoph Gärditz¹, Oliver Weiß³, Arvid Hunze⁴, Karsten Heuser⁴, Ralph Pätzold⁴, Dmitry Poplavskyy⁵ und Albrecht Winnacker¹ — ¹Department of Materials Science VI, University of Erlangen-Nuremberg, Germany — ²Department of Experimental Physics, University of Freiberg, Germany — ³Department of Materials Science, TU Darmstadt, Germany — ⁴Siemens AG, CT MM 1, Paul-Gossen-Str. 100, 91052 Erlangen, Germany — ⁵OSRAM Opto Semiconductors Inc., 3870 North First Street, San Jose, CA 95134, USA

The mobilities of charge carriers in Organic Light-Emitting Devices (OLEDs) are among the most important material parameters since they not only define the location of the recombination zone but also heavily influence various performance aspects including efficiency and lifetime.

Here we report on two methods for determining hole and electron mobilities in various polymeric OLED materials: transient dark injection current (DI) and transient electroluminescence (EL). Utilising these techniques we have obtained mobility data for a range of polymers which, when combined with steady-state current-voltage and luminance characteristics, provide detailed insight into electronic processes in current light-emitting materials. Furthermore, a closer look at these data allows us to draw conclusions regarding carrier trapping and to identify a correlation between trap distributions and mobilities.

Finally, we explore ways to systematically modify the mobilities of one or both charge carriers in order to improve OLED performances.