Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes

Authors

  • Andreas Haldi,

    1. School of Electrical and Computer Engineering, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0250 (USA)
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  • Alpay Kimyonok,

    1. School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)
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  • Benoit Domercq,

    1. School of Electrical and Computer Engineering, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0250 (USA)
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  • Lauren E. Hayden,

    1. School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)
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  • Simon C. Jones,

    1. School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)
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  • Seth R. Marder,

    Corresponding author
    1. School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)
    • School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA).
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  • Marcus Weck,

    Corresponding author
    1. School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)
    2. Present address: Department of Chemistry and Molecular Design Institute, New York University, New York, NY 10003-6688, USA
    • School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA).
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  • Bernard Kippelen

    Corresponding author
    1. School of Electrical and Computer Engineering, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0250 (USA)
    • School of Electrical and Computer Engineering, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0250 (USA).
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  • This material is based upon work supported in part by Solvay SA, by the STC Program of the National Science Foundation under Agreement Number DMR-0120967, and by the Office of Naval Research. We thank Chun Huang for assistance in the synthesis of compound 2, Dr. Yadong Zhang and Dr. Sushanta Pal for the synthesis of compound 9, and Dr. Stephen Barlow for critical reading of our manuscript.

Abstract

Orange-emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light-emitting diodes (OLEDs). The efficiency of the OLED devices is optimized by varying characteristics of the copolymers: the molecular weight, the iridium loading level, and the nature and length of the linker between the side chains and the polymer backbone. A maximum efficiency of 4.9 ± 0.4%, 8.8 ± 0.7 cd A−1 at 100 cd m−2 is achieved with an optimized copolymer.

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