Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters†,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,Piotr Pander,Wim T. Klooster,Simon J. Coles,Przemyslaw Data,Fernando B. Dias,Peter J. Skabara

Journal of Materials Chemistry C Pub Date : 09/12/2018 00:00:00 , DOI:10.1039/C8TC03390K

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%.