Intermolecular interactions in molecular crystals and their effect on thermally activated delayed fluorescence of helicene-based emitters
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 diazahelicene-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 collections: Recent Open Access Articles, In memory of Paul O’Brien and Journal of Materials Chemistry C top 5% most-read Q4 2018