Synthesis and characterization of bipolar host materials for organic photonic systems

In this thesis, four p-type host material and four bipolar host material were synthesized. The structural characterizations of the synthesized molecules were carried out by FTIR, 1H-NMR ve 13C-NMR spectroscopies. In the p-type host materials, electon donating carbazole (D) groups and bulky tetraphenysilane groups were used together. As a result, hole conducting p-type host materials with high glass transition temperatures (Tg ≥ 120 °C) were obtained. Bipolar host materials are composed of electron donating carbazole and electron accepting (A) triazine groups. Tetraphenylsilane groups were attached between the donor and acceptor groups, and high tiplet energy (ET ≥ 2.9 eV) bipolar host molecules were obtained because of the interruption of the conjugation by the tetraphenylsilane groups. Tert-butyl groups were attached to the 3,6 positions of the carbazoles to increase the solubility of the molecules and as a result, host materials which are soluble in most of the organic solvents (chloroform, toluene, EtOAc etc) were obtained. The photophysical properties of the synthesized molecules were studied by UV-Vis absorption and photoluminescence (PL) spectroscopies and electrochemical properties were studied by cyclic voltammetry (CV) measurements.