A Simple Molecular Design Strategy for Delayed Fluorescence toward 1000 nm.
Authors
Congrave, Daniel G
Conaghan, Patrick J
Francis, Haydn
Credgington, Dan
Publication Date
2019-11-20Journal Title
J Am Chem Soc
ISSN
0002-7863
Publisher
American Chemical Society (ACS)
Volume
141
Issue
46
Pages
18390-18394
Language
eng
Type
Article
This Version
VoR
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Congrave, D. G., Drummond, B. H., Conaghan, P. J., Francis, H., Jones, S. T., Grey, C. P., Greenham, N. C., et al. (2019). A Simple Molecular Design Strategy for Delayed Fluorescence toward 1000 nm.. J Am Chem Soc, 141 (46), 18390-18394. https://doi.org/10.1021/jacs.9b09323
Abstract
Harnessing the near-infrared (NIR) region of the electromagnetic spectrum is exceedingly important for photovoltaics, telecommunications, and the biomedical sciences. While thermally activated delayed fluorescent (TADF) materials have attracted much interest due to their intense luminescence and narrow exchange energies (ΔEST), they are still greatly inferior to conventional fluorescent dyes in the NIR, which precludes their application. This is because securing a sufficiently strong donor-acceptor (D-A) interaction for NIR emission alongside the narrow ΔEST required for TADF is highly challenging. Here, we demonstrate that by abandoning the common polydonor model in favor of a D-A dyad structure, a sufficiently strong D-A interaction can be obtained to realize a TADF emitter capable of photoluminescence (PL) close to 1000 nm. Electroluminescence (EL) at a peak wavelength of 904 nm is also reported. This strategy is both conceptually and synthetically simple and offers a new approach to the development of future NIR TADF materials.
Sponsorship
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/L015978/1)
European Research Council (679789)
Engineering and Physical Sciences Research Council (EP/S003126/1)
EPSRC (2136148)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1021/jacs.9b09323
This record's URL: https://www.repository.cam.ac.uk/handle/1810/298692
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