Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.67: Poster

Tuesday, March 27, 2007, 18:00–20:00, Poster B

Revealing the Dynamics in Polymer-based Optoelectronic Devices — •Sebastian Bange, Andrew Kuksov, and Dieter Neher — Physik weicher Materie, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany

We report on measurements of charge carrier dynamics in polymer light-emitting diodes based on a new commercial blue polyfluorene-type copolymer. Investigations of charge carrier dynamics in thin-film devices face several difficulties due to experimental limitations when transit times reach the submicrosecond regime. For small-molecule devices, some elaborate methods have been reported to overcome limitations which heavily rely on multilayer structures.[1] Here, we report on the application of a new type of transient electroluminescence (TEL) method for the determination of electron dynamics relying on interlayer formation of spincoatable polymers. Detailed investigations show the relationship between our new method, standard TEL in thin film devices and time-of-flight (TOF) studies in thick layers. The role of injection barriers at the contacts is investigated, and the difference in trapping effects for TOF and TEL pointed out.

[1] R. A. Klenkler, G. Xu, H. Aziz et al., Appl Phys Lett 88 (24) (2006)