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 degrees C and onset decomposition temperatures of 346-377 degrees C. Room temperature hole drift mobilities in amorphous films of the materials were, respectively, 1.2 x 10(-6) and 2 x 10(-5) cm(2)/V s at an applied electric field of 3.6 x 10(5) 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. (C) 2005 Elsevier B.V. All rights reserved.