Hole-transporting carbazole-based imines

Abstract

Carbazole-based imines were synthesized by the reactions of 3-amino-9-ethylcarbazole with heteroaromatic aldehydes (3-formyl-9-ethylcarbazole or 3-formyl-10-(2-ethylhexyl)phenothiazine) or with 4,4'-bis(dimethylamino)benzophenone. The characterization of the derivatives synthesized by 1H NMR and IR spectroscopy as well as by MS spectrometry is presented. The electron photoemission spectra of thin layers of the materials were recorded and the ionization potentials of ca 5.3eV were established. Hole drift mobilities in the layers of bisphenol Z polycarbonate containing 50% of the electro-active material reached 4x10-6cm2/Vs at an electric field of 1.4x106V/cm.