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Phosphorescent Light-Emitting Transistors: Harvesting Triplet Excitons

Authors

  • Ebinazar B. Namdas,

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California Santa Barbara, CA 93106 (USA)
    • Center for Polymers and Organic Solids, University of California Santa Barbara, CA 93106 (USA).
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  • Ben B. Y. Hsu,

    1. Center for Polymers and Organic Solids, University of California Santa Barbara, CA 93106 (USA)
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  • Zehua Liu,

    1. Department of Chemistry, Chemical Research Laboratory University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK)
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  • Shih-Chun Lo,

    1. Centre for Organic Photonics and Electronics School of Chemistry and Molecular Biosciences The University of Queensland Chemistry Building, QLD 4072 (Australia)
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  • Paul L. Burn,

    Corresponding author
    1. Centre for Organic Photonics and Electronics School of Chemistry and Molecular Biosciences The University of Queensland Chemistry Building, QLD 4072 (Australia)
    • Centre for Organic Photonics and Electronics School of Chemistry and Molecular Biosciences The University of Queensland Chemistry Building, QLD 4072 (Australia).
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  • Ifor D. W. Samuel

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California Santa Barbara, CA 93106 (USA)
    2. Organic Semiconductor Centre, SUPA School of Physics and Astronomy, University of St Andrews North Haugh, St Andrews, Fife, KY16 9SS (UK)
    • Organic Semiconductor Centre, SUPA School of Physics and Astronomy, University of St Andrews North Haugh, St Andrews, Fife, KY16 9SS (UK).
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Abstract

Phosphorescent light-emitting transistors, in which light emission from singlet and triplet energy levels is harvested using solution-processed materials (see figure), are presented. While a green phosphorescent dendrimer exhibits an external quantum efficiency of 0.45% at 480 cd m−2, a red polymer/phosphorescent small-molecule blend produces a brightness exceeding 30 cd m−2 with a relatively high hole mobility of 2.5 × 10−2 cm2 V−1 s−1.

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