Molecular Modulation Based on the Terminal Substituent in Twistacenes for Organic Light-Emitting Diodes
Wei C., Wu J., Zhang D., Su W., Xiao J., Cui Z.
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Three novel end-capping twistacene derivatives with phenyl (PyDP), naphthyl (PyDN), and anthryl groups (PyDA) have been designed and synthesized. Given the crystallographic analyses, the as-prepared molecules exhibited a twisted topological structure with the torsion angles of 35.99° for PyDP and 45.85° for PyDA. In addition, there is no π-stacking interaction in PyDP. However, PyDA displayed π-stacking interactions between the terminal intermolecular anthracene groups. The electroluminescent performance of OLEDs shows that devices with PyDP and PyDA outperform the PyDN-based device, which is attributable to their higher fluorescence quantum yields. The maximum EQE value for PyDP reaches 3.10 %, which illustrates that the terminal substituent can affect the performance of OLEDs to a certain extent.