Photoemission studies on interfaces between an electroluminescent green polyfluorene (GPF) and two conducting polymers comprising ethylenedioxythiophene and sulfonate moieties are reported. Despite the chemical similarity of both conducting polymers, the hole injection barriers to GPF were found to differ by and the interface dipoles by up to . Polymer light emitting devices fabricated with the two conducting polymers exhibit nearly identical current-voltage characteristics, but the luminance-voltage characteristic is enhanced by a factor of 20 by the presence of near-surface poly(styrenesulfonate). We attribute the enhancement to the electron- blocking behavior of the sulfonate moieties at the GPF interface and the concomitant modification of the device built-in voltage.
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15 July 2006
Research Article|
July 26 2006
Green polyfluorene-conducting polymer interfaces: Energy level alignment and device performance
Norbert Koch;
Institut für Physik,
Humboldt-Universität zu Berlin
, Newtonstrasse 15, D-12489 Berlin, Germany
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Andreas Elschner;
Andreas Elschner
H. C. Starck GmbH
, Research Electronic Materials, c∕o Bayer AG, D-51368 Leverkusen, Germany
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Robert L. Johnson
Robert L. Johnson
Institut für Experimentalphysik,
Universität Hamburg
, Luruper Chaussee 149, D-22761 Hamburg, Germany
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a)
Electronic mail: norbert.koch@physik.hu-berlin.de
J. Appl. Phys. 100, 024512 (2006)
Article history
Received:
January 09 2006
Accepted:
April 23 2006
Citation
Norbert Koch, Andreas Elschner, Robert L. Johnson; Green polyfluorene-conducting polymer interfaces: Energy level alignment and device performance. J. Appl. Phys. 15 July 2006; 100 (2): 024512. https://doi.org/10.1063/1.2216283
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