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Proceedings Paper

PAni as a hole injection layer for OLEDs and PLEDs
Author(s): Bernd Werner; J. Posdorfer; Bernhard Wessling; Susanne Heun; Heinrich Becker; Horst Vestweber; T. Hassenkam
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Paper Abstract

Although polyaniline (PAni) has been proposed for use as a hole injection layer (HIL) in organic light emitting diodes (OLEDs) and polymeric light emitting diodes (PLEDs) from very early on, the material does not seem to have found widespread use on a (pre)commercial scale. Recent results will be presented showing that PAni can be efficiently used as HIL, and that it even has some advantages over the often preferred poly[ethylenedioxy-thiophene] (PEDT). Intensive investigations on the influence of conductivity, morphology and especially the work function onto device performance have led to a commercially available water-borne PAni dispersion. The stable, nanoscaled system for HILs has a particle size of about 35 nm and a lateral conductivity (when deposited and dried) of around 10-6 S/cm. Using PAni dispersions for the generation of HILs the final device performance in OLEDs and PLEDs could be significantly improved. Depending on the used light emitting polymer (LEP), luminescence data were up to 30% more efficient compared to devices made with the widespread used PEDT.

Paper Details

Date Published: 3 March 2003
PDF: 8 pages
Proc. SPIE 4800, Organic Light-Emitting Materials and Devices VI, (3 March 2003); doi: 10.1117/12.451902
Show Author Affiliations
Bernd Werner, Ormecon Chemie GmbH & Co. (Germany)
J. Posdorfer, Ormecon Chemie GmbH & Co. (Germany)
Bernhard Wessling, Ormecon Chemie GmbH & Co. (Germany)
Susanne Heun, Covion Organic Semiconductors GmbH (Germany)
Heinrich Becker, Covion Organic Semiconductors GmbH (Germany)
Horst Vestweber, Covion Organic Semiconductors GmbH (Germany)
T. Hassenkam, Nano-Science Ctr. (Denmark)

Published in SPIE Proceedings Vol. 4800:
Organic Light-Emitting Materials and Devices VI
Zakya H. Kafafi; Homer Antoniadis, Editor(s)

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