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Journal of Materials Science

, Volume 32, Issue 21, pp 5709–5715 | Cite as

Poly(p-phenylene vinylene) light-emitting devices prepared via the precursor route onto indium tin oxide and fluorine-doped tin dioxide substrates

  • M HEROLD
  • J GMEINER
  • C DRUMMER
  • M SCHWOERER
Article

Abstract

For the preparation of organic light-emitting devices (LEDs) an optically transparent and electrically conducting thin film is needed as anode. Usually, a glass substrate coated with indium tin oxide (ITO) is used. We show that ITO is unsuitable in the case of poly(p-phenylene vinylene) (PPV) prepared by the precursor route. We have found that a reaction in which hydrogen chloride is eliminated during the thermal conversion to PPV and the ITO takes place. Scanning electron microscopy investigations of the ITO-PPV interface demonstrates that indium chloride compounds, e.g., InCl3 crystals with dimensions up to 40 μm, are produced. Photoluminescence measurements reveal that the fluorescence efficiency is quenched by a factor of 2–23 in the case of ITO compared with PPV converted onto usual glass. In a second step we have investigated LEDs prepared from PPV in the ITO/PPV/Al configuration in order to obtain information about the process responsible for the degradation of these devices. We shall show that the formation of the above-mentioned indium chloride compounds is one possible degradation mechanism and is responsible for the relative short lifetimes of these LEDs. To overcome this problem we propose to use fluorine-doped tin dioxide (FTO) instead of ITO. Finally, we show the results obtained for LEDs in the FTO/PPV/Al configuration and compare them with ITO/PPV/Al devices.

Keywords

Indium Oxide Thermal Conversion Phenylene Vinylene Onset Voltage Tetrahydrothiophene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • M HEROLD
    • 1
  • J GMEINER
    • 1
  • C DRUMMER
    • 1
  • M SCHWOERER
    • 1
  1. 1.Lehrstuhl fur Experimentalphysik II, and Bayreuther Institut fur MakromolekulforschungUniversitat BayreuthBayreuthGermany

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