Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.79: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Dynamics of Charge Carrier Transport and Electroluminescence in Organic Light-Emitting Diodes — •Anton G. Mückl1 and Wolfgang Brütting21Experimentalphysik II, Universität Bayreuth, D-95440 Bayreuth — 2Experimentalphysik IV, Universität Augsburg, D-86135 Augsburg

When describing the dynamics of charge carrier transport and recombination processes in organic light-emitting devices not only the dependence of the drift mobility of the majority charge carriers on temperature and applied electric field is important but also the dynamics of the minority charge carriers should be considered. We have investigated the mobility of electrons and holes in Alq3 at various temperatures and electric fields using time resolved electroluminescence measurements on a specially designed multilayer OLED structure. Both, electron and hole mobility show a Poole-Frenkel-type dependence on temperature and electric field, however in contrast to the electron transport the hole transport is found to be non-dispersive with a temperature independent field enhancement factor. These results indicate clearly the mechanisms of electron and hole transport in Alq3 to be of different nature.
We also measured the time-resolved current through unipolar and bipolar single and double layer OLED structures at various temperatures. The decay of the current towards the steady-state value will be discussed in terms of the dynamics of the built-up of space charges and trap filling.

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