High transparency electrochromic polymers

An electrochromic device, comprising:

• a first insulating substrate;
• a first conducting layer disposed over the first insulating substrate;
• an electrochromic layer disposed over the first conducting layer, wherein the electrochromic layer comprises an electrochromic polymer having a polymer backbone comprising one or more meta-conjugated linkers (MCLs) and one or more aromatic moieties (Ars), wherein each of the one or more MCLs is partially conjugated with one of the one or more Ars at a meta position of the one or more MCLs;
• an electrolyte layer disposed over the electrochromic layer;
• a second conducting layer disposed over the electrolyte layer;
• and
• a second insulating substrate disposed over the second conducting layer;
• wherein a thickness of the electrochromic layer is from 10 nm to 5800 nm resulting in transmittance of 70%-99.9% at a wavelength of 550 nm at a neutral state of the electrochromic layer;
• wherein the electrochromic device has transmittance of 50% or more at a wavelength of 550 nm at a bleached state of the device;
• and
• wherein the electrochromic polymer is colorless in the neutral state of the electrochromic layer.