| Abstract [eng] |
Electroactive organic compounds are used as light-emitting materials for optoelectronic devices such as light-emitting diodes, solar cells and electrophotographic photoreceptors. Phenothiazine and carbazole-based compounds have advantageous characteristics such as thermal and electrochemical stability, high electron/hole conductivity and efficient luminescence. Due to these properties phenothiazine and carbazole with trifluorophenyl- acceptor group were chosen for this study. The materials were synthesized by Ullman-coupling and Suzuki-coupling methods.The structures of the synthesized compounds were proved by 1H and 13C NMR spectroscopy and mass spectrometry. The behavior on heating of compounds was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) under a nitrogen atmosphere. A temperature ranging from 277°C to 384 °C of compounds. The ionization potentials of the derivatives were estimated by cyclic voltammetry (CV). They were found to be comparable and ranged from 4.85–5.25 eV. The electron photoemission spectra of layers of the derivatives showed the ionization potentials of 5.84–6.19 eV. The fluorescence emission wavelength of compounds is in the region of green-blue light. Triplet energy values ranging from 2.58 eV to 2.88 eV were determined from phosphorescence spectra. Because of favourable triplet energy values these compounds were tested as exciplex forming systems with acceptor 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine. Also, the technological scheme of the intermediate compound production is reported. |
