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Rigid and planar π-conjugated molecules leading to long-lived intramolecular charge-transfer states exhibiting thermally activated delayed fluorescence

Author

Listed:
  • Suman Kuila

    (Department of Physics, Durham University
    Durham University
    University of Colorado Boulder)

  • Hector Miranda-Salinas

    (Department of Physics, Durham University)

  • Julien Eng

    (Newcastle University)

  • Chunyong Li

    (Department of Physics, Durham University)

  • Martin R. Bryce

    (Durham University)

  • Thomas J. Penfold

    (Newcastle University)

  • Andrew P. Monkman

    (Department of Physics, Durham University)

Abstract

Intramolecular charge transfer (ICT) occurs when photoexcitation causes electron transfer from an electron donor to an electron acceptor within the same molecule and is usually stabilized by decoupling of the donor and acceptor through an orthogonal twist between them. Thermally activated delayed fluorescence (TADF) exploits such twisted ICT states to harvest triplet excitons in OLEDs. However, the highly twisted conformation of TADF molecules results in limited device lifetimes. Rigid molecules offer increased stability, yet their typical planarity and π-conjugated structures impedes ICT. Herein, we achieve dispersion-free triplet harvesting using fused indolocarbazole-phthalimide molecules that have remarkably stable co-planar ICT states, yielding blue/green-TADF with good photoluminescence quantum yield and small singlet-triplet energy gap

Suggested Citation

  • Suman Kuila & Hector Miranda-Salinas & Julien Eng & Chunyong Li & Martin R. Bryce & Thomas J. Penfold & Andrew P. Monkman, 2024. "Rigid and planar π-conjugated molecules leading to long-lived intramolecular charge-transfer states exhibiting thermally activated delayed fluorescence," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53740-1
    DOI: 10.1038/s41467-024-53740-1
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    References listed on IDEAS

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    1. Hyung Suk Kim & Sang Hoon Lee & Seunghyup Yoo & Chihaya Adachi, 2024. "Understanding of complex spin up-conversion processes in charge-transfer-type organic molecules," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
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