Electrochromic smart windows regulate environmental temperature by modulating optical transmittance through voltage control, which are applicable to buildings, aircraft, and vehicles. 3,4 - propylenedioxythiophene (ProDOT)-based electrochromic polymers (ECP) are considered highly promising for smart window applications due to chemically tunable multicolor states, fast response, and excellent processability. However, ECP used in smart windows must be weather resistance. 3,4 - propylenedioxythiophene-alt-phenylene yellow copolymer (ECP-Yellow) exhibits wide bandgaps and strong UV absorption, leading to poor stability of the film under solar irradiation. Yet yellow is a primary component in the subtractive CMYK and is critical for expanding ProDOT-based color palettes. This study developed an innovative crosslinking strategy employing a X3DAZP crosslinker. The cycle stability of the crosslinked ECP-Yellow film was increased from 1000 to 3000 cycles. Unencapsulated crosslinked films exhibit 2.3 - and 3 - fold improvements in durability under 85 °C/85 % relative humidity (RH) test and 100-fold intensified light exposure compared to non-crosslinked counterparts. The taupe-tinted material obtained by mixing yellow and magenta ProDOT-based polymers effectively extends the color of the ProDOT system, and the crosslinked film also enhances the durability and cyclic stability. We used ProDOT-based magenta and cyan materials to verify the universality of the crosslinking scheme, and the stability of the electrochromic film was improved. This scheme provides an effective research path for polythiophene-based electrochromic window.
Smart electrochromic (EC) glasses with visible light modulation have attracted considerable attention due to their unique advantages, but EC sunglasses with anti-blue-ray function have not yet been reported. Herein, a series of wide-bandgap electrochromic conjugated polymers P2–P4 based on 3,4-propylenedioxythiophene (ProDOT) and naphthalene units were designed and synthesized using direct arylation polymerization. Among them, polymers P2 exhibit a satisfactory yellow hue and outstanding overall electrochromic performances. By tuning the intramolecular torsion between ProDOT and naphthalene units in the polymer structure, the absorption spectra of polymers P3 were entirely shifted to the high-energy violet-blue spectra region relative to the anti-blue-ray function. New dual conjugated polymer electrochromic devices based on P3 and black-to-transmissive electrochromic polymer were fabricated, which exhibited the fast transformation between black and anti-blue-ray transmissive color with a switching time of < 5.0 s, high contrast of 49% at 400–700 nm and a high coloring efficiency of 470.8 cm 2 /C. Moreover, an EC prototype sunglasses device with an anti-blue-ray function was fabricated to demonstrate the practical suitability based on the dual conjugated polymer ECDs. This work contributes to the application of EC technology to the smart glasses field.
危险品化学品经营许可证（带存储）