Thermally activated delayed fluorescence carbazole‐triazine dendrimer with bulky substituents

DOI Web Site 被引用文献4件 参考文献77件 オープンアクセス
  • Hiroki Ikebe
    Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka Japan
  • Kohei Nakao
    Institute for Materials Chemistry and Engineering Kyushu University Kasuga Japan
  • Eri Hisamura
    Institute for Materials Chemistry and Engineering Kyushu University Kasuga Japan
  • Minori Furukori
    Department of Pure and Applied Chemistry Graduate School of Science and Technology Tokyo University of Science Noda Chiba Japan
  • Yasuo Nakayama
    Department of Pure and Applied Chemistry Graduate School of Science and Technology Tokyo University of Science Noda Chiba Japan
  • Takuya Hosokai
    Department of Pure and Applied Chemistry Graduate School of Science and Technology Tokyo University of Science Noda Chiba Japan
  • Minlang Yang
    Institute for Advanced Study Kyushu University Nishi‐ku Fukuoka Japan
  • Guanting Liu
    Institute for Advanced Study Kyushu University Nishi‐ku Fukuoka Japan
  • Takuma Yasuda
    Institute for Advanced Study Kyushu University Nishi‐ku Fukuoka Japan
  • Ken Albrecht
    Institute for Materials Chemistry and Engineering Kyushu University Kasuga Japan

書誌事項

公開日
2023-08-17
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by/4.0/
DOI
  • 10.1002/agt2.405
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Carbazole‐triazine dendrimers with a bulky terminal substituent were synthesized, and the thermally activated delayed fluorescence (TADF) property was investigated. Compared to unsubstituted carbazole dendrimers, dendrimers with bulky terminal substituents showed comparable to better photoluminescence quantum yields (PLQY) in neat films. Phenylfluorene (PF)‐substituted dendrimers showed the highest PLQY of 81%, a small Δ<jats:italic>E</jats:italic><jats:sub>st</jats:sub> of 0.06 eV, and the fastest reverse intersystem crossing (RISC) rate of ∼1 × 10<jats:sup>5</jats:sup> s<jats:sup>−1</jats:sup> compared to other dendrimers. Phosphorescence measurements of dendrimers and dendrons (fragments) indicate that the close proximity of the triplet energy of phenylfluorene‐substituted carbazole dendrons (<jats:sup>3</jats:sup>LE) to that of phenylfluorene‐substituted dendrimers (<jats:sup>1</jats:sup>CT, <jats:sup>3</jats:sup>CT) contributes to RISC promotion and improves TADF efficiency. Terminal modification fine‐tunes the energy level and suppresses intermolecular interactions, and this study provides a guideline for designing efficient solution‐processable and non‐doped TADF materials.</jats:p>

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