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A solution-processable near-infrared thermally activated delayed fluorescent dye with a fused aromatic acceptor and aggregation induced emission behavior

journal contribution
posted on 10.03.2022, 14:12 by Daniel G Congrave, Bluebell H Drummond, Qinying Gu, Stephanie Montanaro, Haydn Francis, Víctor Riesgo-González, Weixuan Zeng, Campbell SB Matthews, Simon Dowland, Iain WrightIain Wright, Clare P Grey, Richard H Friend, Hugo Bronstein
The unique synergy of properties offered by an efficient and processable near-infrared thermally activated delayed fluorescent (NIR TADF) dye could be transformative across research fields. Here, a solution-processable NIR TADF material is demonstrated (CAT-TPE). Good solubility is achieved through the use of a new tetraphenylethylene (TPE)-based triphenylamine electron donor. TADF is confirmed through variable temperature time-resolved measurements at a peak photoluminescence (PL) wavelength of 842 nm in a solution-processed film. An OLED with good roll-off characteristics for a solution-processed NIR TADF device is reported with electroluminescence λmax > 700 nm. CAT-TPE also demonstrates classic aggregation induced emission (AIE) behavior, being more emissive when aggregated than in solution with all PL > 700 nm. This work opens the door to the considerably enhanced structural diversity of solution-processable NIR TADF and will inform the design of future high efficiency AIE NIR TADF materials.

Funding

Herchel Smith fund

Control of spin and coherence in electronic excitations in organic and hybrid organic/inorganic semiconductor structures

Engineering and Physical Sciences Research Council

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European Research Council (ERC)

EPSRC Centre for Doctoral Training in Sustainable and Functional Nano

Engineering and Physical Sciences Research Council

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Cambridge Trust

China Scholarship Council

Loughborough University

3D-Localisation - Three Dimensionally Defined Non-Fullerene Acceptors

Engineering and Physical Sciences Research Council

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RSC (grant no. RF19-2751)

Faraday Institution [grant numbers FIRG001 and FIRG024]

History

School

  • Science

Department

  • Chemistry

Published in

Journal of Materials Chemistry C

Volume

10

Issue

12

Pages

4831-4836

Publisher

Royal Society of Chemistry (RSC)

Version

AM (Accepted Manuscript)

Rights holder

© The Royal Society of Chemistry

Publisher statement

This paper was accepted for publication in the journal Journal of Materials Chemistry C and the definitive published version is available at https://doi.org/10.1039/d1tc04753a.

Acceptance date

04/01/2022

Publication date

2022-01-07

Copyright date

2022

ISSN

2050-7526

eISSN

2050-7534

Language

en

Depositor

Dr Iain Wright. Deposit date: 9 March 2022