INTERNATIONAL CHEMISTRY & BIOLOGY CONFERENCE’19, Shubra-Al-Khaymah, Egypt, 01 August 2019, pp.68
Conjugated electroactive dendrimers are an appealing class of organic materials that
combine a good charge transfer properties and high stability for organic optoelectronic devices
. Fluorene based electroactive materials are especially important for the OLEDs due to their
easy synthesis, good processability, and high fluorescence quantum yield for blue light .
Besides, Carbazole and Thiophene based electroactive structures have been used as charge
transport layer in the OPVs and ECDs owing to high charge carrier mobility, high photochemical,
and thermal stability .
In this study, a series of fluorene centered denrimeric molecules containing different
numbers of Carbazole and Thiophene moieties as the peripheral groups were prepared by Ullman
and Suzuki coupling reaction. Sturucture of synthesized dendrimers were identified from FT-IR,
1H-NMR and Maldi-Tof MS . The dendrimers was directly coated onto ITO/Glass surface via
potentiodynamic electrochemical cross-coupling process in 0.1 M TBAPF6-Acetonitrile solutions.
According to AFM results, the higher porous surface can be obtained from crosslinked second
generation dendrimer (CFD-3 and CFTD-2) films on the ITO/Glass surface. The electrochromic
properties of the electractive crosslinked dendrimer film were investigated by
spectroelectrochemical measurements. The neutral state colorless/transparent electroactive films
turned into dark blue upon applied positive potential for all.