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Integrated pulsed photoconductivity of organic light-emitting diodes

Appl. Phys. Lett. 83, 5473 (2003); doi:10.1063/1.1629785

Issue Date: 29 December 2003

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A. Tapponnier, I. Biaggio, M. Koehler, and P. Günter
Nonlinear Optics Laboratory, Institute of Quantum Electronics, Swiss Federal Institute of Technology Zürich, ETH Hönggerberg, CH-8093 Zürich, Switzerland
We analyze the transient photoconductivity induced by short light pulses in organic light-emitting diodes (OLEDs) to characterize the charge transport dynamics with high time resolution over four time decades. We show how integrated pulsed photoconductivity (IPP) can be used as a diagnostic method for finished, packaged OLEDs to determine and characterize the presence of impurities or other effects that influence the efficiency of charge transport. We demonstrate the usefulness of the method by comparing a simple one-layer Alq3 device on indium tin oxide (ITO) to a device where a nanometer thin NPB film separates the Alq3 from the ITO. In the single-layer device a charge transport dynamics stretching over several decades is observed, probably due to Alq3 contamination by its direct contact with ITO. ©2003 American Institute of Physics.
History: Received 4 August 2003; accepted 29 September 2003
Permalink: http://link.aip.org/link/?APPLAB/83/5473/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.60.Jb
    Light-emitting devices
  • 73.50.Pz
    Photoconduction and photovoltaic effects in thin films
  • 78.66.Qn
    Optical properties of polymers; organic compounds (thin films)
  • 06.60.Mr
    Testing and inspecting procedures
  • YEAR: 2003

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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