LAUSR

Electrochromic technologies require electrochromic π-conjugated polymers to reversibly transition between highly transmissive and broadly absorbing achromatic states, fast response time, and high kinetic stability. In this work, yellow-to-transmissive electrochromic poly(dibenzothiophene/dibenzofuran-bithiophene) (PDBT-2Th and PDBF-2Th) were prepared by electropolymerization of monomers DBT-2Th and DBF-2Th. Attaching bithiophene at both the 2 and 8 positions of dibenzothiophene and dibenzofuran, the extended conjugation of both electrochromic π-conjugated polymers showed good redox activity with two obvious redox peaks, high optical contrast (41% at 950 nm, PDBF-2Th), favorable response time (1.4 s for PDBT-2Th), decent coloration efficiency (359 cm 2 C −1 at 547 nm, PDBF-2Th), and excellent kinetic stability (both remained 93% after 1000 s).