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A Simple Molecular Design Strategy for Delayed Fluorescence toward 1000 nm.

Published version
Peer-reviewed

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Authors

Congrave, Daniel G 
Drummond, Bluebell H  ORCID logo  https://orcid.org/0000-0001-5940-8631
Conaghan, Patrick J 
Francis, Haydn 

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.

Description

Keywords

3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences

Journal Title

J Am Chem Soc

Conference Name

Journal ISSN

0002-7863
1520-5126

Volume Title

141

Publisher

American Chemical Society (ACS)
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)
EPSRC (1948660)