Phenothiazinyl-containing aromatic amines as novel amorphous molecular materials for optoelectronics

Novel aromatic amines have been synthesized by the modified Ullmann reaction of 10H-phenothiazine and di(4-iodophenyl)ethylamine or 3,6-diiodo-9-hexylcarbazole. The full characterization of their structure is presented. The compounds possess high thermal stability with glass transition temperatures of 87-103 °C and onset decomposition temperatures of 346-377 °C. Room temperature hole drift mobilities in amorphous films of the materials were, respectively, 1.2 × 10−6 and 2 × 10−5 cm2/V s at an applied electric field of 3.6 × 105 V/cm. The electron photoemission spectra of the molecular glasses have been recorded and the ionisation potentials of 5.5-5.54 eV have been established. The values obtained have been compared with the values of ionisation potential of photoconductive oligomers containing unsubstituted carbazolyl or diphenylamino groups.