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Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors
Advanced Materials
Swansea University Author: Emrys Evans
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DOI (Published version): 10.1002/adma.202402790
Abstract
Spin triplet exciton formation sets limits on technologies using organic semiconductors that are confined to singlet-triplet photophysics. In contrast, excitations in the spin doublet manifold in organic radical semiconductors can show efficient luminescence. Here we explore the dynamics of the spin...
Published in: | Advanced Materials |
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ISSN: | 0935-9648 1521-4095 |
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Wiley
2024
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URI: | https://cronfa.swan.ac.uk/Record/cronfa66573 |
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v2 66573 2024-06-03 Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors 538e217307dac24c9642ef1b03b41485 0000-0002-9092-3938 Emrys Evans Emrys Evans true false 2024-06-03 EAAS Spin triplet exciton formation sets limits on technologies using organic semiconductors that are confined to singlet-triplet photophysics. In contrast, excitations in the spin doublet manifold in organic radical semiconductors can show efficient luminescence. Here we explore the dynamics of the spin allowed process of intermolecular energy transfer from triplet to doublet excitons. We employ a carbene-metal-amide (CMA-CF3) as a model triplet donor host, since following photoexcitation it undergoes extremely fast intersystem crossing to set up a population of triplet excitons within 4 ps. This enables a foundational study for tracking energy transfer from triplets to a model radical semiconductor, TTM-3PCz. Over 74% of all radical luminescence originates from the triplet channel in this system under photoexcitation. We find that intermolecular triplet-to-doublet energy transfer can occur directly and rapidly, with 12% of triplet excitons transferring already on sub-ns timescales. This enhanced triplet harvesting mechanism is utilised in efficient near-infrared organic light-emitting diodes, which can be extended to other opto-electronic and -spintronic technologies by radical-based spin control in molecular semiconductors. Journal Article Advanced Materials 0 Wiley 0935-9648 1521-4095 doublet emission; exciton management; OLEDs; photophysics; radical materials 31 5 2024 2024-05-31 10.1002/adma.202402790 http://dx.doi.org/10.1002/adma.202402790 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University SU Library paid the OA fee (TA Institutional Deal) Cambridge Trust China Scholarship Council - 201808060075 Engineering and Physical Sciences Research Council - EP/M005143/1 Engineering and Physical Sciences Research Council - EP/W018519/1 Engineering and Physical Sciences Research Council - EP/S022953/1 H2020 European Research Council - 101020167 National Natural Science Foundation of China - 2019TD-33 National Natural Science Foundation of China - 51925303 Royal Society - URF\R1\201300 Simons Foundation - 601946 2024-07-04T12:11:03.4091598 2024-06-03T12:31:22.5695707 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry Qinying Gu 1 Sebastian Gorgon 2 Alexander S. Romanov 3 Feng Li 4 Richard H. Friend 5 Emrys Evans 0000-0002-9092-3938 6 66573__30685__81a9192eabb34bb5a8ac40c9fa841952.pdf 66573.VOR.pdf 2024-06-19T16:14:56.7356239 Output 2110836 application/pdf Version of Record true true eng http://creativecommons.org/licenses/by/4.0/ |
title |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
spellingShingle |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors Emrys Evans |
title_short |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
title_full |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
title_fullStr |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
title_full_unstemmed |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
title_sort |
Fast Transfer of Triplet to Doublet Excitons from Organometallic Host to Organic Radical Semiconductors |
author_id_str_mv |
538e217307dac24c9642ef1b03b41485 |
author_id_fullname_str_mv |
538e217307dac24c9642ef1b03b41485_***_Emrys Evans |
author |
Emrys Evans |
author2 |
Qinying Gu Sebastian Gorgon Alexander S. Romanov Feng Li Richard H. Friend Emrys Evans |
format |
Journal article |
container_title |
Advanced Materials |
container_volume |
0 |
publishDate |
2024 |
institution |
Swansea University |
issn |
0935-9648 1521-4095 |
doi_str_mv |
10.1002/adma.202402790 |
publisher |
Wiley |
college_str |
Faculty of Science and Engineering |
hierarchytype |
|
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facultyofscienceandengineering |
hierarchy_top_title |
Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
department_str |
School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry |
url |
http://dx.doi.org/10.1002/adma.202402790 |
document_store_str |
1 |
active_str |
0 |
description |
Spin triplet exciton formation sets limits on technologies using organic semiconductors that are confined to singlet-triplet photophysics. In contrast, excitations in the spin doublet manifold in organic radical semiconductors can show efficient luminescence. Here we explore the dynamics of the spin allowed process of intermolecular energy transfer from triplet to doublet excitons. We employ a carbene-metal-amide (CMA-CF3) as a model triplet donor host, since following photoexcitation it undergoes extremely fast intersystem crossing to set up a population of triplet excitons within 4 ps. This enables a foundational study for tracking energy transfer from triplets to a model radical semiconductor, TTM-3PCz. Over 74% of all radical luminescence originates from the triplet channel in this system under photoexcitation. We find that intermolecular triplet-to-doublet energy transfer can occur directly and rapidly, with 12% of triplet excitons transferring already on sub-ns timescales. This enhanced triplet harvesting mechanism is utilised in efficient near-infrared organic light-emitting diodes, which can be extended to other opto-electronic and -spintronic technologies by radical-based spin control in molecular semiconductors. |
published_date |
2024-05-31T12:11:02Z |
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1803646625704312832 |
score |
11.016235 |