SYNTHESıS OF A NEW ELECTROCHROMıC POLYMER BASED ON TETRAPHENYLETHYLENE CORED TETRAKıS CARBAZOLE COMPLEX AND ıTS ELECTROCHROMıC DEVıCE APPLıCATıON

• A novel tetraphenylethylene containing tetrakis carbazole electropolymerized polymer was synthesized.
• The polymer displayed transparent colored to dark green coloration upon oxidation.
• A neutral state colorless electrochromic device was constructed.

Poly-1,1,2,2-tetrakis(4-9H-carbazol-9-yl)phenyl)ethene P(TCP) was successfully synthesized by electrochemical oxidation of corresponding monomer, namely, 1,1,2,2-tetrakis(4-9H-carbazol-9-yl)phenyl)ethene (TCP) using dichloromethane as the solvent and tetrabutylammonium hexafluorophosphate (TBAPF6) as supporting electrolyte. Spectroelectrochemical properties of P(TCP) were investigated in situ recording the electronic absorption spectra of the polymer film coated on indium-tin oxide (ITO) at various potentials. P(TCP) displayed transparent to military green color in 1.80 s with an optical contrast of 23.0% (at 770 nm) and an optical band gap of 3.1 eV. The objective evaluation of the colors of P(TCP) at various potentials was performed through colorimetry studies on the basis of “Commission Internationale de l′Eclairage” (CIE) standards. The morphology of the polymer film was investigated by AFM analysis. A dual type electrochromic device based on P(TCP) was constructed and its spectroelectrochemical properties were investigated. The electrochromic device exhibits color change from transparent to dark blue with a good open circuit memory.

Figure optionsDownload as PowerPoint slide