Charge transport polymers for light emitting diodes*

Authors

  • Dr. Xiao-Chang Li,

    1. University Chemical Laboratory Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
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  • Tuck Mun Yong,

    1. University Chemical Laboratory Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
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  • Dr. Franco Cacialli,

    1. Cauendish Laboratory Department of Physics, University of Cambridge Madingley Road, Cambridge CB3 CHE (UK)
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  • Dr. Johannes Grüner,

    1. Cauendish Laboratory Department of Physics, University of Cambridge Madingley Road, Cambridge CB3 CHE (UK)
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  • Prof. Richard H. Friend,

    1. Cauendish Laboratory Department of Physics, University of Cambridge Madingley Road, Cambridge CB3 CHE (UK)
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  • Dr. Andrew B. Holmes,

    Corresponding author
    1. Melville Laboratoty for Polymer Synthesis, Department of Chemistry, University of Cambridge, Pembroke Street. Cambridgr CB2 3RA(UK)
    • Melville Laboratoty for Polymer Synthesis, Department of Chemistry, University of Cambridge, Pembroke Street. Cambridgr CB2 3RA(UK)
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  • Mark Giles,

    1. Melville Laboratoty for Polymer Synthesis, Department of Chemistry, University of Cambridge, Pembroke Street. Cambridgr CB2 3RA(UK)
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  • Dr. Stephen C. Moratti

    1. Melville Laboratoty for Polymer Synthesis, Department of Chemistry, University of Cambridge, Pembroke Street. Cambridgr CB2 3RA(UK)
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  • *

    Financial support from the Engineering and Physical Sciences Research Council (UK), the European Commission (ESPRIT Project No. 8013 ‘LEDFOS’; BRITE-EURAM Contract ‘POLYLED’, BRE2-CT93-0592), and the ICI Strategic Research Fund is gratefully acknowledged. We thank Dr. L. Greer for assistance with the differential scanning calorimetry measurements.

Abstract

Electron transport polymers containing aromatic oxadiazole side chain chromophores have been designed and synthesized. They have been found useful for improving the quantum efficiency, lowering the turn-on voltage, and enabling the use of the more stable aluminum cathode in the fabrication of polymer LEDs. As the oxadiazole units are chemically bound to the polymer chain, rather than being simply dispersed in a polymer matrix, the materials are expected to exhibit long-term morphological stability. The synthesis and several different applications are presented.

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