A Simple Molecular Design Strategy for Delayed Fluorescence Toward 1000 Nm

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2019 Oct 30

PMID 31661267

Citations 20

Authors

Daniel G Congrave

Bluebell H Drummond

Patrick J Conaghan

Haydn Francis

Saul T E Jones

Clare P Grey

Neil C Greenham

Dan Credgington

Hugo Bronstein

Affiliations

Soon will be listed here.

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 (Δ), 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 Δ 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.

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