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

Daniel G. Congrave*, Bluebell H. Drummond, Qinying Gu, Stephanie Montanaro, Haydn Francis, Víctor Riesgo-González, Weixuan Zeng, Campbell S.B. Matthews, Simon Dowland, Iain A. Wright, Clare P. Grey, Richard H. Friend, Hugo Bronstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.

Original languageEnglish
Pages (from-to)4831-4836
Number of pages6
JournalJournal of Materials Chemistry C
Volume10
Issue number12
Early online date7 Jan 2022
DOIs
Publication statusE-pub ahead of print - 7 Jan 2022

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