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 °C, 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 cm2/V s at an applied electric field of 6.4×105 V/cm.