Efficient Electron Injection from a Bilayer Cathode Consisting of Aluminum and Alcohol-/Water-Soluble Conjugated Polymers

Authors

  • H. Wu,

    1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, P.R. China
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  • F. Huang,

    1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, P.R. China
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  • Y. Mo,

    1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, P.R. China
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  • W. Yang,

    1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, P.R. China
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  • D. Wang,

    1. Department of Electrical & Computer Engineering, University of California, San Diego, CA 92093, USA
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  • J. Peng,

    1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640, P.R. China
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  • Y. Cao

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  • The authors are grateful to the Ministry of Science and Technology Project (No. 2002CB613402) and the Natural Science Foundation of China (Project No. 90101019) for the financial support. We thank Dr. S. Xiao of Organic Vision Inc. for supplying PFO polymer.

Abstract

original image

A bilayer cathode consisting of aminoalkyl-substituted polyfluorene and Al layers (see Figure) effectively injects electrons into an electroluminescent polymer emitting layer. The alcohol- and water-soluble polyfluorene, and its quaternized salt, can be used to fabricate polymer light-emitting diodes with device performance comparable to, or exceeding, devices using Ba/Al cathodes.

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