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

Junki Ochi, Yuki Yamasaki, Kojiro Tanaka, Yasuhiro Kondo, Kohei Isayama, Susumu Oda, Masakazu Kondo and Takuji Hatakeyama ()
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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

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-46619-8

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