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Efficient near-infrared organic light-emitting diodes with emission from spin doublet excitons
Hwan-Hee Cho 
,
Sebastian Gorgon ,
Giacomo Londi ,
Samuele Giannini ,
Changsoon Cho ,
Pratyush Ghosh ,
Claire Tonnelé ,
David Casanova ,
Yoann Olivier ,
Tomi K. Baikie ,
Feng Li ,
David Beljonne ,
Neil C. Greenham ,
Richard H. Friend ,
Emrys Evans
,
Sebastian Gorgon ,
Giacomo Londi ,
Samuele Giannini ,
Changsoon Cho ,
Pratyush Ghosh ,
Claire Tonnelé ,
David Casanova ,
Yoann Olivier ,
Tomi K. Baikie ,
Feng Li ,
David Beljonne ,
Neil C. Greenham ,
Richard H. Friend ,
Emrys Evans
Nature Photonics
Swansea University Author:
Emrys Evans
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DOI (Published version): 10.1038/s41566-024-01458-3
Abstract
The development of luminescent organic radicals has resulted in materials with excellent optical properties for near-infrared emission. Applications of light generation in this range span from bioimaging to surveillance. Although the unpaired electron arrangements of radicals enable efficient radiat...
| Published in: | Nature Photonics |
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| ISSN: | 1749-4885 1749-4893 |
| Published: |
Springer Science and Business Media LLC
2024
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66524 |
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| Abstract: |
The development of luminescent organic radicals has resulted in materials with excellent optical properties for near-infrared emission. Applications of light generation in this range span from bioimaging to surveillance. Although the unpaired electron arrangements of radicals enable efficient radiative transitions within the doublet-spin manifold in organic light-emitting diodes, their performance is limited by non-radiative pathways introduced in electroluminescence. Here we present a host–guest design for organic light-emitting diodes that exploits energy transfer with up to 9.6% external quantum efficiency for 800 nm emission. The tris(2,4,6-trichlorophenyl)methyl-triphenyl-amine radical guest is energy-matched to the triplet state in a charge-transporting anthracene-derivative host. We show from optical spectroscopy and quantum-chemical modelling that reversible host–guest triplet–doublet energy transfer allows efficient harvesting of host triplet excitons. |
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| College: |
Faculty of Science and Engineering |
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This work was supported by the Engineering and Physical Sciences Research Council (EPSRC, grant no. EP/M005143/1). E.W.E acknowledges funding from the Royal Society for a University Research Fellowship (URF/R1/201300) and the EPSRC grant no. EP/W018519/1. This project received funding from the ERC under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 101020167). H.-H.C. acknowledges the George and Lilian Schiff Foundation for PhD funding. P.G. acknowledges the support provided by the Cambridge Trust, George and Lilian Schiff Foundation, A. Rao, and St John’s College, Cambridge during the course of the research. The work in Namur and Mons was funded by the Belgian National Fund for Scientific Research (F.R.S.-FNRS) within the Consortium des Équipements de Calcul Intensif (CÉCI), under grant no. 2.5020.11, and by the Walloon Region (ZENOBE Tier-1 supercomputer) under grant no. 1117545. G.L. and Y.O. acknowledge funding from the F.R.S.-FNRS under grant no. F.4534.21 (MIS-IMAGINE). D.B. is a FNRS research director. The work at the DIPC was funded by the Spanish Government MICINN (project no. PID2019-109555GB-I00), the Gipuzkoa Provincial Council (project no. QUAN-000021-01), the European Union (project NextGenerationEU/PRTR-C17.I1), as well as by the IKUR Strategy under the collaboration agreement between Ikerbasque Foundation and DIPC on behalf of the Department of Education of the Basque Government. D.C and C.T. are thankful for the technical and human support provided by the Donostia International Physics Center (DIPC) Computer Center. C.T. is supported by DIPC and Gipuzkoa’s council joint program Women and Science. F.L. is grateful for receiving financial support from the National Natural Science Foundation of China (grant no. 51925303). |