Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters

Anastasia Klimash; Piotr Pander; Wim T. Klooster; Simon J. Coles; Przemyslaw Data; Fernando B. Dias; Peter J. Skabara

doi:10.1039/C8TC03390K

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Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters†

Anastasia Klimash,

^a Piotr Pander,

^b Wim T. Klooster,^c Simon J. Coles,

^c Przemyslaw Data,^b Fernando B. Dias

*^b and Peter J. Skabara

*^a

Author affiliations

* Corresponding authors

^a WestCHEM, School of Chemistry, University of Glasgow, Glasgow, UK
E-mail: peter.skabara@glasgow.ac.uk

^b Department of Physics, Durham University, Durham, UK

^c School of Chemistry, University of Southampton, Southampton, UK

Abstract

Here, we discuss the influence of the crystal structure on the photophysical properties of two new TADF emitters containing a non-planar helical moiety. The presence of solvent in the crystal lattice of a diaza[5]helicene-based compound alters molecular packing significantly and suppresses aggregation. This results in more intense TADF emission and an increase in PLQY. Solution-processed OLED devices gave a maximum external quantum efficiency of 7.1%.

This article is part of the themed collection: In memory of Paul O’Brien

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DOI: https://doi.org/10.1039/C8TC03390K
Article type: Paper
Submitted: 10 Qad 2018
Accepted: 11 Way 2018
First published: 12 Way 2018
This article is Open Access

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J. Mater. Chem. C, 2018,6, 10557-10568

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Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters

A. Klimash, P. Pander, W. T. Klooster, S. J. Coles, P. Data, F. B. Dias and P. J. Skabara, J. Mater. Chem. C, 2018, 6, 10557 DOI: 10.1039/C8TC03390K

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Journal of Materials Chemistry C

Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters†

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Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters

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