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Highly efficient multi-resonance thermally activated delayed fluorescence material toward a BT.2020 deep-blue emitter

Author

Listed:
  • Junki Ochi

    (Kyoto University)

  • Yuki Yamasaki

    (Kwansei Gakuin University)

  • Kojiro Tanaka

    (Kyoto University)

  • Yasuhiro Kondo

    (Ltd.)

  • Kohei Isayama

    (Ltd.)

  • Susumu Oda

    (Toyo University)

  • Masakazu Kondo

    (Ltd.)

  • Takuji Hatakeyama

    (Kyoto University)

Abstract

An ultrapure deep-blue multi-resonance-induced thermally activated delayed fluorescence material (DOB2-DABNA-A) is designed and synthesized. Benefiting from a fully resonating extended helical π-conjugated system, this compound has a small ΔEST value of 3.6 meV and sufficient spin–orbit coupling to exhibit a high-rate constant for reverse intersystem crossing (kRISC = 1.1 × 106 s–1). Furthermore, an organic light-emitting diode employing DOB2-DABNA-A as an emitter is fabricated; it exhibits ultrapure deep-blue emission at 452 nm with a small full width at half maximum of 24 nm, corresponding to Commission Internationale de l’Éclairage (CIE) coordinates of (0.145, 0.049). The high kRISC value reduces the efficiency roll-off, resulting in a high external quantum efficiency (EQE) of 21.6% at 1000 cd m–2.

Suggested Citation

  • Junki Ochi & Yuki Yamasaki & Kojiro Tanaka & Yasuhiro Kondo & Kohei Isayama & Susumu Oda & Masakazu Kondo & Takuji Hatakeyama, 2024. "Highly efficient multi-resonance thermally activated delayed fluorescence material toward a BT.2020 deep-blue emitter," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46619-8
    DOI: 10.1038/s41467-024-46619-8
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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. Naoya Aizawa & Yu Harabuchi & Satoshi Maeda & Yong-Jin Pu, 2020. "Kinetic prediction of reverse intersystem crossing in organic donor–acceptor molecules," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    3. Anton Pershin & David Hall & Vincent Lemaur & Juan-Carlos Sancho-Garcia & Luca Muccioli & Eli Zysman-Colman & David Beljonne & Yoann Olivier, 2019. "Highly emissive excitons with reduced exchange energy in thermally activated delayed fluorescent molecules," Nature Communications, Nature, vol. 10(1), pages 1-5, December.
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