Synthesis and characterization of novel D-pi-A type organic dyes

This thesis decals with synthesis and characterization of novel donor pi-conjugated acceptor (D-pi-A) organic materials. Novel D-pi-A organic materials (1-20) containing different donor and linker units for using as dye molecules in dye solar cells (DSCs) were successfully synthesized. The target molecules were characterized by 1H-NMR. 13C-NMR, FT-IR, and MALDI-TOF M8 techniques. The optical study by UV-Vis spectroscopy indicated that designed molecules exhibit an adsorption band cover UV and visible region. All compounds show good thermal properties . Moreover, Density function theory (DFT) calculations have been performed on the dyes and the results show that electron distribution from the electron donors to the electron acceptors occurred during the HOMO-LUMO excitation. The photovoltaic performance of DSCs using these materials as dyes is under investigation and will be reported in the future. Finally, the multi-triphenylamine-substituted carbazoles (T2C, T3C and T4C) for using as hole-transporting layer in organic light-emitting diodes (OLEDs) were successfully synthesized and characterized. The thermal and electrochemical stability and formation of an amorphous form in the material was improved by increasing number of triphenylmine substiments in the molecule. T2C, T3C and T4C compounds show excellent hole-transporting property for Alq3-based green OLED with device’s luminance efficiency in the range of 4.97-5.07 cd/A.