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Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs

By inverting the common structural motif of thermally activated delayed fluorescence materials to a rigid donor core and multiple peripheral acceptors, reverse intersystem crossing (rISC) rates are demonstrated in an organic material that enables utilization of triplet excited states at faster rates...

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Autores principales: dos Santos, Paloma L., Ward, Jonathan S., Congrave, Daniel G., Batsanov, Andrei S., Eng, Julien, Stacey, Jessica E., Penfold, Thomas J., Monkman, Andrew P., Bryce, Martin R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010696/
https://www.ncbi.nlm.nih.gov/pubmed/29938177
http://dx.doi.org/10.1002/advs.201700989
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author dos Santos, Paloma L.
Ward, Jonathan S.
Congrave, Daniel G.
Batsanov, Andrei S.
Eng, Julien
Stacey, Jessica E.
Penfold, Thomas J.
Monkman, Andrew P.
Bryce, Martin R.
author_facet dos Santos, Paloma L.
Ward, Jonathan S.
Congrave, Daniel G.
Batsanov, Andrei S.
Eng, Julien
Stacey, Jessica E.
Penfold, Thomas J.
Monkman, Andrew P.
Bryce, Martin R.
author_sort dos Santos, Paloma L.
collection PubMed
description By inverting the common structural motif of thermally activated delayed fluorescence materials to a rigid donor core and multiple peripheral acceptors, reverse intersystem crossing (rISC) rates are demonstrated in an organic material that enables utilization of triplet excited states at faster rates than Ir‐based phosphorescent materials. A combination of the inverted structure and multiple donor–acceptor interactions yields up to 30 vibronically coupled singlet and triplet states within 0.2 eV that are involved in rISC. This gives a significant enhancement to the rISC rate, leading to delayed fluorescence decay times as low as 103.9 ns. This new material also has an emission quantum yield ≈1 and a very small singlet–triplet gap. This work shows that it is possible to achieve both high photoluminescence quantum yield and fast rISC in the same molecule. Green organic light‐emitting diode devices with external quantum efficiency >30% are demonstrated at 76 cd m(−2).
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spelling pubmed-60106962018-06-22 Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs dos Santos, Paloma L. Ward, Jonathan S. Congrave, Daniel G. Batsanov, Andrei S. Eng, Julien Stacey, Jessica E. Penfold, Thomas J. Monkman, Andrew P. Bryce, Martin R. Adv Sci (Weinh) Full Papers By inverting the common structural motif of thermally activated delayed fluorescence materials to a rigid donor core and multiple peripheral acceptors, reverse intersystem crossing (rISC) rates are demonstrated in an organic material that enables utilization of triplet excited states at faster rates than Ir‐based phosphorescent materials. A combination of the inverted structure and multiple donor–acceptor interactions yields up to 30 vibronically coupled singlet and triplet states within 0.2 eV that are involved in rISC. This gives a significant enhancement to the rISC rate, leading to delayed fluorescence decay times as low as 103.9 ns. This new material also has an emission quantum yield ≈1 and a very small singlet–triplet gap. This work shows that it is possible to achieve both high photoluminescence quantum yield and fast rISC in the same molecule. Green organic light‐emitting diode devices with external quantum efficiency >30% are demonstrated at 76 cd m(−2). John Wiley and Sons Inc. 2018-04-16 /pmc/articles/PMC6010696/ /pubmed/29938177 http://dx.doi.org/10.1002/advs.201700989 Text en © 2018 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
dos Santos, Paloma L.
Ward, Jonathan S.
Congrave, Daniel G.
Batsanov, Andrei S.
Eng, Julien
Stacey, Jessica E.
Penfold, Thomas J.
Monkman, Andrew P.
Bryce, Martin R.
Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title_full Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title_fullStr Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title_full_unstemmed Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title_short Triazatruxene: A Rigid Central Donor Unit for a D–A(3) Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
title_sort triazatruxene: a rigid central donor unit for a d–a(3) thermally activated delayed fluorescence material exhibiting sub‐microsecond reverse intersystem crossing and unity quantum yield via multiple singlet–triplet state pairs
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010696/
https://www.ncbi.nlm.nih.gov/pubmed/29938177
http://dx.doi.org/10.1002/advs.201700989
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