Photoconductive, photoluminescent and glass-forming 6,6′-di(N-diphenylamino)-9,9′-dialkyl-3,3′-bicarbazoles

Novel branched molecules 6,6'-di(N-diphenylamino)-9,9'-dialkyl-3,3'-bicarbazoles have been synthesised and found to constitute glass-forming materials with glass-transition temperatures in the range of 72-128 degreesC, as characterised by differential scanning calorimetry. The electron photoemission spectra of the materials have been recorded and the ionisation potentials of 5.25-5.30 eV have been established. Room temperature hole-drift mobility in the amorphous film of 6,6'-di(N-dimethylphenylamino)-9,9'-butyl-3,3'-bicarbazole established by the time-of-flight technique approaches 10(-6) cm(2) N s at an applied electric field of 6.4 x 10(5) V/cm. (C) 2004 Elsevier B.V. All rights reserved.