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1 December 1997 Polymer electroluminescent devices with zirconium carbide cathodes
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The behavior of polymeric electroluminescent devices made using ZrC cathodes, a soluble phenylene vinylene polymer, and Au anodes is reported. ZrC is a highly air-stable metal with a work function of about 3.6 eV. Polycrystalline thin films can be formed on sapphire with electron beam evaporation and subsequent annealing at ca. 500 deg C. The devices exhibit a lower turn-on voltage than corresponding devices with Al cathodes, but very low efficiency; their lifetime is not longer than with other cathodes. The current-luminance-voltage-time characteristics suggest that the recombination zone is close to the cathode, that the metal is not exidized and efficiently quenches the excitons, and that the negative charge carriers are effectively trapped by the polymer.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James R. Sheats, William A. Mackie, Samir Anz, and Tienbao Xie "Polymer electroluminescent devices with zirconium carbide cathodes", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997);

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