3,6-Di(diphenylamino)-9-alkylcarbazole-based hole-transporting hydrazones

The synthesis of a series of new glass-forming hydrazones containing carbazole and diphenylamine moieties is reported. The thermal, optical and photoelectrical properties of mono-, di- and tetra-substituted compounds are compared. The glass transition temperatures of the newly synthesized hydrazones range from 75 to 145 °C. The ionization potentials of the films of hydrazones, measured by the electron photoemission technique, range from 4.74 to 5.15 eV. Hole-drift mobilities of the solid solutions of hydrazones in bisphenol Z polycarbonate (50 wt.%) are in the range of 6.3 × 10−6 to 1.1 × 10−5 cm2/Vs at electric field of 6.4 × 105 V/cm as characterized by the time-of-flight method.