| abstract |
The invention provides improved solution-phase electrochromic devices, wherein the solution of reversibly variable transmittance is tinted with a tint-providing compound or comprises as a cathodic compound a salt of the formulan nwherein R 17 and R 18 are independently selected from the group consisting of an alkyl group with 1-20 carbon atoms, phenyl and benzyl ; and Rg, R io , R 11 , and R 12 are independently selected from the group consisting of hydrogen and an alkyl group with 1-4 carbon atoms, provided that at least one of Rg, R 10 , R 11 , and R 12 is an alkyl group. The invention further provides solutions of reversibly variable transmittance for use in the improved devices of the invention. An electrochromic device of the invention can be used, for example, as the component of reversibly variable transmittance in a variable-reflectance motor vehicle mirror. Among such mirrors provided by the invention are blue-tinted mirrors. |