This group of inventions relates to a field of applied electric chemistry, namely, devices based on modified electrochromic compounds and method of their manufacturing, more specifically, to electrochromic devices comprising electrodes, at least one of which is optically transparent, said electrodes forming an enclosed space filled with a solution which includes an aprotic inert solvent, or their mixtures, an acrylic and/or methacrylic unsaturated oligomer-monomer composition, a cathodic material comprising pyridine, an anodic material, a photo initiator, an adhesive and indifferent electrolytes. According to the invention, the electrochromic solution also comprises an optical brightener selected from the range of aromatic or heterocyclic series and/or their mixtures, an antioxidant selected from the range of sterically hindered phenols and/or their mixtures. The achieved technical result is increased service life of the electrochromic device.