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US 5,209,980 AGranted
Transparent counterelectrodes
AssigneePPG Industries, Inc.
InventorRalph E. Spindler
Life of this patent
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Abstract
Novel transparent complementary electrode materials for electrochromic cells are disclosed, of the general formula [M.sup.1 ].sub.4 [M.sup.2 (CN).sub.6 ].sub.3 wherein M.sup.1 may be indium, gallium, gadolinium, lanthanum, and M.sup.2 is iron. Unlike Prussian blue (where M.sup.1 and M.sup.2 are both iron), the complementary electrode materials of the present invention are stable, and do not have to be precharged.
Claims9
An article having variable transmittance in response to an electric field comprising:
- a. a transparent substrate;
- b. a transparent electroconductive electrode material;
- c. a transparent electrochromic material;
- d. a transparent proton-conducting polymer electrolyte;
- e. a transparent complementary electroconductive material of the general formula [M.sup.1 ].sub.4 [M.sup.2 (CN).sub.6 ].sub.3 wherein M.sup.1 is selected from the group consisting of indium, gallium, gadolinium, lanthanum, nickel, copper and vanadium, and M.sup.2 is selected from the group consisting of iron and ruthenium.
2 more elements
Dependencies are inferred from the claim text.