Hot exciplexes in U-shaped TADF molecules with emission from locally excited states

A. Lennart Schleper, Kenichi Goushi (), Christoph Bannwarth (), Bastian Haehnle, Philipp J. Welscher, Chihaya Adachi () and Alexander J. C. Kuehne ()
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A. Lennart Schleper: Ulm University, Albert-Einstein-Allee 11
Kenichi Goushi: Kyushu University
Christoph Bannwarth: RWTH Aachen University
Bastian Haehnle: Ulm University, Albert-Einstein-Allee 11
Philipp J. Welscher: Ulm University, Albert-Einstein-Allee 11
Chihaya Adachi: Kyushu University
Alexander J. C. Kuehne: Ulm University, Albert-Einstein-Allee 11

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Fast emission and high color purity are essential characteristics of modern opto-electronic devices, such as organic light emitting diodes (OLEDs). These properties are currently not met by the latest generation of thermally activated delayed fluorescence (TADF) emitters. Here, we present an approach, called “hot exciplexes” that enables access to both attributes at the same time. Hot exciplexes are produced by coupling facing donor and acceptor moieties to an anthracene bridge, yielding an exciplex with large T1 to T2 spacing. The hot exciplex model is investigated using optical spectroscopy and quantum chemical simulations. Reverse intersystem crossing is found to occur preferentially from the T3 to the S1 state within only a few nanoseconds. Application and practicality of the model are shown by fabrication of organic light-emitting diodes with up to 32 % hot exciplex contribution and low efficiency roll-off.

Date: 2021
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DOI: 10.1038/s41467-021-26439-w

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