Triazatruxene: A Rigid Central Donor Unit for a D–A3 Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs
Abstract 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 fas...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-06-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.201700989 |
| _version_ | 1797754256692871168 |
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| author | Paloma L. dos Santos Jonathan S. Ward Daniel G. Congrave Andrei S. Batsanov Julien Eng Jessica E. Stacey Thomas J. Penfold Andrew P. Monkman Martin R. Bryce |
| author_facet | Paloma L. dos Santos Jonathan S. Ward Daniel G. Congrave Andrei S. Batsanov Julien Eng Jessica E. Stacey Thomas J. Penfold Andrew P. Monkman Martin R. Bryce |
| author_sort | Paloma L. dos Santos |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-12T17:29:55Z |
| format | Article |
| id | doaj.art-adfca78e54ea477a9b3ddea275f72bee |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-03-12T17:29:55Z |
| publishDate | 2018-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-adfca78e54ea477a9b3ddea275f72bee2023-08-05T03:41:20ZengWileyAdvanced Science2198-38442018-06-0156n/an/a10.1002/advs.201700989Triazatruxene: A Rigid Central Donor Unit for a D–A3 Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State PairsPaloma L. dos Santos0Jonathan S. Ward1Daniel G. Congrave2Andrei S. Batsanov3Julien Eng4Jessica E. Stacey5Thomas J. Penfold6Andrew P. Monkman7Martin R. Bryce8Department of Physics Durham University South Road Durham DH1 3LE UKDepartment of Chemistry Durham University South Road Durham DH1 3LE UKDepartment of Chemistry Durham University South Road Durham DH1 3LE UKDepartment of Chemistry Durham University South Road Durham DH1 3LE UKChemistry School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UKChemistry School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UKChemistry School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UKDepartment of Physics Durham University South Road Durham DH1 3LE UKDepartment of Chemistry Durham University South Road Durham DH1 3LE UKAbstract 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.https://doi.org/10.1002/advs.201700989fast reverse intersystem crossing ratesthermally activated delayed fluorescence (TADF)triazatruxene |
| spellingShingle | Paloma L. dos Santos Jonathan S. Ward Daniel G. Congrave Andrei S. Batsanov Julien Eng Jessica E. Stacey Thomas J. Penfold Andrew P. Monkman Martin R. Bryce Triazatruxene: A Rigid Central Donor Unit for a D–A3 Thermally Activated Delayed Fluorescence Material Exhibiting Sub‐Microsecond Reverse Intersystem Crossing and Unity Quantum Yield via Multiple Singlet–Triplet State Pairs Advanced Science fast reverse intersystem crossing rates thermally activated delayed fluorescence (TADF) triazatruxene |
| title | Triazatruxene: A Rigid Central Donor Unit for a D–A3 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–A3 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–A3 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–A3 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–A3 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 a3 thermally activated delayed fluorescence material exhibiting sub microsecond reverse intersystem crossing and unity quantum yield via multiple singlet triplet state pairs |
| topic | fast reverse intersystem crossing rates thermally activated delayed fluorescence (TADF) triazatruxene |
| url | https://doi.org/10.1002/advs.201700989 |
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