From phosphorescence to delayed fluorescence in one step: tuning photophysical properties by quaternisation of an sp2-hybridised nitrogen atom

Klimash, Anastasia, Prlj, Antonio, Yufit, Dmitry S., Mallick, Abhijit, Curchod, Basile F. E., McGonigal, Paul R., Skabara, Peter and Etherington, Marc (2022) From phosphorescence to delayed fluorescence in one step: tuning photophysical properties by quaternisation of an sp2-hybridised nitrogen atom. Journal of Materials Chemistry C. ISSN 2050-7526 (In Press)

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Official URL: https://doi.org/10.1039/D2TC01737G

Abstract

Control of the delayed emission of organic compounds is an important factor in the development of new display technology and for the emerging use of organic emitters in sensing and fluorescence microscopy. In particular, there is a need to understand how the phenomena of room-temperature phosphorescence and thermally activated delayed fluorescence intersect. Here, we show that delayed fluorescence can be activated in room temperature phosphorescence emitters by quaternising the sp2-hybridised heterocyclic nitrogens. Furthermore by judicious positioning of a carbazole donor in the meta- or para- position with respect to the ring nitrogen atom, structural and sterical influences combine to tune the origins of the delayed fluorescence from triplet–triplet annihilation to thermally activated delayed fluorescence. Crucially, the quaternisation of nitrogen provides us with the means to fine tune singlet and triplet states in a predictable manner, uncover the intersection between phosphorescence and delayed fluorescence and tip the balance in favour of delayed fluorescence.

Item Type: Article
Additional Information: Funding information: This research has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement H2020-MSCA-ITN2015/674990 project ‘‘EXCILIGHT’’. A.K. also thanks the EPSRC for funding (EP/T013710/1). M.K.E. thanks the Royal Society of Chemistry (R20-1668) for support. The authors also thank Andrew P. Monkman for use of his facilities for the spectroscopic work.
Subjects: F100 Chemistry
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 25 May 2022 09:58
Last Modified: 20 Jun 2022 08:00
URI: http://nrl.northumbria.ac.uk/id/eprint/49188

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