Spray processable green to highly transmissive electrochromics via chemically polymerizable donor-acceptor heterocyclic pentamers

An approach for engineering soluble and processable neutral state green conjugated polymers of tunable hues which possess highly transmissive oxidized states, fast switching times, redox switching stability, and excellent optical contrasts in visible and near infrared (NIR) region, was reported. The approach illustrates designing conjugated polymers with a two-band absorption in the visible spectra so as to reflect and transmit the color green in the neutral state. It is found that symmetric addition of ProDOT on the donor-acceptor trimeric precursors induces a bathochromic shift in the ranges 55-62 nm for the lower wavelength absorption band. The relative luminance can also be modulated and optimized as a function of deposited film thickness, while the materials in their neutral state exhibit a saturated green color.