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Delayed Luminescence Spectroscopy of Organic Photovoltaic Binary Blend Films: Probing the Emissive Non-geminate Charge Recombination

Authors

  • Panagiotis E. Keivanidis,

    Corresponding author
    1. Centre for Plastic Electronics, Imperial College London, Department of Physics, London SW7 2AZ (UK)
    • Centre for Plastic Electronics, Imperial College London, Department of Physics, London SW7 2AZ (UK).
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  • Valentin Kamm,

    1. Max Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz (Germany)
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  • Clare Dyer-Smith,

    1. Centre for Plastic Electronics, Imperial College London, Department of Physics, London SW7 2AZ (UK)
    2. Centre for Plastic Electronics, Imperial College London., Department of Chemistry, London SW7 2AZ (UK)
    3. Grantham Institute for Climate Change, Imperial College London, London SW7 2AZ (UK)
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  • Weimin Zhang,

    1. Centre for Plastic Electronics, Imperial College London., Department of Chemistry, London SW7 2AZ (UK)
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  • Frédéric Laquai,

    1. Max Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz (Germany)
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  • Iain McCulloch,

    1. Centre for Plastic Electronics, Imperial College London., Department of Chemistry, London SW7 2AZ (UK)
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  • Donal D. C. Bradley,

    1. Centre for Plastic Electronics, Imperial College London, Department of Physics, London SW7 2AZ (UK)
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  • Jenny Nelson

    1. Centre for Plastic Electronics, Imperial College London, Department of Physics, London SW7 2AZ (UK)
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Abstract

Organic photovoltaics: Following the direct photoexcitation of the low-energy optical gap PDI component in the F8BT:PDI photovoltaic blend film (step 1), charge generation takes place (steps 2, 3). Non-geminate charge recombination (step 4) results in the generation of delayed luminescence (DL) in the μs time scale (step 5). The DL spectrum originates from an equilibrated charge-transfer (CT) state formed between the components of the composite. The F8BT–PDI CT complex has a ground state character (step 6).

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