Preparation Of Terpyridine Complexes And Properties Of All-solid-state Electrochromic Devices

Organic electrochromic materials with tripyridine group are the hot issue of focus in green photovoltaic materials due to its rich colors and fast color conversion speed. In this paper, three kinds of different tripyridine-based compounds, totaling 13 target compounds, were synthesized using fluorenyl, phenyl and triphenylamine as substitutent group to terpyridine as precursors, and their structures were characterized in different methods. The optical performance and electrochromic mechanism of the compounds were tested via UV-visible spectrophotometry and cyclic voltammetry. The results showed that: organic metal compounds achieves electrochromic through charge transferring between the metal ions and the ligands.Electrochromic films of each tripyridine compounds were prepared by free deposited or electrochemical deposition on ITO conductive glass according to properties of each compounds respectively, and their optical performance were tested. All-solid-state electrochromic devices based on conductive ITO glass were fabricated using LiClO4/PMMA/PC polymer electrolyte as PE layer and electrochromic films as electrochromic layer, and the performances of the devices were tested. The results showed that the electrochromic device of tripyridine metal complexes have reversible colors change under the potential less than 2.5V. The different complexes which composed with the same ligand and different metal ions can have a completely different color conversion. And the open memory time test of the ECD shows that complexes containing rich electronic group has a longer time to the open memory.