Electrochromic cell having a mixed solid ion-conducting layer
AssigneeAmerican Cyanamid Company
InventorsRobert D. Giglia, Gottfried Haacke
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Abstract
An electrochromic device comprises a layer of electrochromic tungsten oxide in contact with an ion-conductive insulating layer of codeposited mixture of SiO and Cr.sub.2 O.sub.3 between electrodes of reversible polarity for alternately coloring and erasing the electrochromic layer by alternate application of current in opposite directions. The mixture of components in the ion-conductive layer improves cycling life of the device.
Claims3
An electrochromic device comprising a layer of inorganic electrochromic material having one of its surfaces in ion-conductive contact with a surface of a single ion-conductive insulating layer which consists essentially of a codeposited mixture of SiO and Cr.sub.2 O.sub.3, with those two layers disposed between two electrode surfaces with means for passing electric current in reversible directions through the two layers for alternate coloration and erasing of the electrochromic layer wherein the ratio of Cr.sub.2 O.sub.3 to SiO in said codeposited mixture is the equivalent of a ratio in the range from 2.5 to 50 m.mu. film thickness of Cr.sub.2 O.sub.3 to 160 m.mu. film thickness of SiO.
Dependencies are inferred from the claim text.