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Proceedings Paper

Trapping and charge transport in organic LEDs
Author(s): Carsten A. Tschamber; Arvid Hunze; Dirk Buchhauser; Wiebke Sarfert; Christoph Gärditz; Oliver Weiss; Ralph Pätzold; Dmitry Poplavskyy; Karsten Heuser; Albrecht Winnacker
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Paper Abstract

The transport of charge carriers in polymer-based Organic Light-Emitting Diodes (OLEDs) as determined by the hopping mobility is an important factor influencing both lifetime and performance of OLED devices. It is strongly dependent on the density and energetic distribution of trap states in the polymer material. Especially in multi-component copolymers single functional groups can act as hole or electron traps determining the optical and electrical characteristics of the device. Transient measurements of the charge carrier mobility together with steady-state current-voltage characteristics are used to investigate the behavior of three blue polyspiro-based light-emitting polymers (LEP) with varying compositions. The first material is a simple homopolymer, the second adds a hole transporting component which is copolymerized into the backbone and the third, most complex, additionally includes a blue chromophore. With some of the added components acting as charge carrier traps the electrical behaviour of the diodes changes significantly.

Paper Details

Date Published: 9 October 2005
PDF: 8 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593718 (9 October 2005); doi: 10.1117/12.616520
Show Author Affiliations
Carsten A. Tschamber, Univ. of Erlangen-Nuremberg (Germany)
Siemens AG (Germany)
Arvid Hunze, Siemens AG (Germany)
Dirk Buchhauser, Siemens AG (Germany)
Univ. of Freiberg (Germany)
Wiebke Sarfert, Univ. of Erlangen-Nuremberg (Germany)
Siemens AG (Germany)
Christoph Gärditz, Univ. of Erlangen-Nuremberg (Germany)
Siemens AG (Germany)
Oliver Weiss, Siemens AG (Germany)
Technical Univ. of Darmstadt (Germany)
Ralph Pätzold, Siemens AG (Germany)
Dmitry Poplavskyy, OSRAM Opto Semiconductors Inc. (United States)
Karsten Heuser, Siemens AG (Germany)
Albrecht Winnacker, Univ. of Erlangen-Nuremberg (Germany)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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