Carbazole-containing enamines as charge transport materials for electrophotography

Synthesis and thermal, optical as well as photoelectrical properties of carbazole-based enamines are reported. The synthesized compounds were found to form glasses with the glass transition temperatures up to 104 degrees C as characterized by differential scanning calorimetry. Electron photoemission spectra of the synthesized enamines have been recorded and the ionization potentials have been established. The lowest value of ionization potential (5.22 eV) and the best charge transport properties were shown by di(2,2-diphenylvinyl)(9-ethyl-3-carbazolyl)amine. Room temperature hole-drift mobilities in its 50% solid solutions in bisphenol Z polycarbonate established by the xerographic time-of-flight technique were found to be 9 x 10(-5) cm(2) V-1 s(-1) at electric field of 10(6) V cm(-1). (C) 2008 Elsevier B.V. All rights reserved.