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Hot exciplexes in U-shaped TADF molecules with emission from locally excited states

Author

Listed:
  • A. Lennart Schleper

    (Ulm University, Albert-Einstein-Allee 11)

  • Kenichi Goushi

    (Kyushu University
    Kyushu University)

  • Christoph Bannwarth

    (RWTH Aachen University)

  • Bastian Haehnle

    (Ulm University, Albert-Einstein-Allee 11)

  • Philipp J. Welscher

    (Ulm University, Albert-Einstein-Allee 11)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University)

  • Alexander J. C. Kuehne

    (Ulm University, Albert-Einstein-Allee 11
    DWI – Leibniz-Institute for Interactive Materials)

Abstract

Fast emission and high color purity are essential characteristics of modern opto-electronic devices, such as organic light emitting diodes (OLEDs). These properties are currently not met by the latest generation of thermally activated delayed fluorescence (TADF) emitters. Here, we present an approach, called “hot exciplexes” that enables access to both attributes at the same time. Hot exciplexes are produced by coupling facing donor and acceptor moieties to an anthracene bridge, yielding an exciplex with large T1 to T2 spacing. The hot exciplex model is investigated using optical spectroscopy and quantum chemical simulations. Reverse intersystem crossing is found to occur preferentially from the T3 to the S1 state within only a few nanoseconds. Application and practicality of the model are shown by fabrication of organic light-emitting diodes with up to 32 % hot exciplex contribution and low efficiency roll-off.

Suggested Citation

  • A. Lennart Schleper & Kenichi Goushi & Christoph Bannwarth & Bastian Haehnle & Philipp J. Welscher & Chihaya Adachi & Alexander J. C. Kuehne, 2021. "Hot exciplexes in U-shaped TADF molecules with emission from locally excited states," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26439-w
    DOI: 10.1038/s41467-021-26439-w
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    References listed on IDEAS

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    1. Hironori Kaji & Hajime Suzuki & Tatsuya Fukushima & Katsuyuki Shizu & Katsuaki Suzuki & Shosei Kubo & Takeshi Komino & Hajime Oiwa & Furitsu Suzuki & Atsushi Wakamiya & Yasujiro Murata & Chihaya Adach, 2015. "Purely organic electroluminescent material realizing 100% conversion from electricity to light," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    2. Ryota Ieuji & Kenichi Goushi & Chihaya Adachi, 2019. "Triplet–triplet upconversion enhanced by spin–orbit coupling in organic light-emitting diodes," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
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    Cited by:

    1. Lei Hua & Yuchao Liu & Binbin Liu & Zhennan Zhao & Lei Zhang & Shouke Yan & Zhongjie Ren, 2022. "Constructing high-efficiency orange-red thermally activated delayed fluorescence emitters by three-dimension molecular engineering," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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