Abstract
A donor–acceptor (D–A) type conjugated polymer is comprised of one (or more) electron donating (D) building block and one (or more) electron accepting (A) block in the repeat unit. By selecting appropriate D and A units, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies and other accompanying properties of the polymer can be fine-tuned to obtain the desired energy levels and optoelectronic properties. D–A polymers have been widely studied for organic photovoltaics (OPVs), organic thin film transistors (OTFTs), organic phototransistors (OPTs), chemical/biological sensors, and electrochromic (EC) devices. This chapter discusses the recent advances in the development of D–A polymers for electrochromic applications with an emphasis on the color engineering and key electrochromic properties as such optical contrast, switching speed, coloration efficiency, and cycling stability. We aim to provide new insight into the structure-property relationship of D–A type electrochromic polymers for the development of novel materials with further improved performance.
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