Bin Huang, Q. Qi, Wei Jiang
Dec 1, 2014
Citations
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Influential Citations
40
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Journal
Dyes and Pigments
Abstract
Abstract A series of bipolar materials for thermally activated delayed fluorescence based on 3,6-di-tert-butyl-9-((phenylsulfonyl)phenyl)-9H-carbazoles, is synthesized by Ulmann coupling reactions. In these materials, the 3,6-di-tert-butylcarbazole group is linked at the 3-, 4- position or 3′-, 4′- position of diphenyl sulfone. The effects of the conjugation connectivity on the electronic, photophysical and electrochemical properties of these materials, are studied by extensive UV–vis, fluorescence spectroscopic measurements, cyclic voltammetry and theoretical calculations as well as X-ray crystallographic analysis. The energy gap between singlet and triplet in these materials is tuned from 0.39 eV to 0.22 eV by manipulation of conjugation of the electron donor units.