Tungsten niobate electrochromic device
AssigneeBell Telephone Laboratories, Incorporated
InventorsGary D. Boyd, Ross A. Lemons, James C. Phillips, Joseph P. Remeika, Edward G. Spencer
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Abstract
Disclosed is an electro-optical device in which color changes are electrically induced in an electrochromic material which is a single or polycrystalline niobium tungstate represented approximately by the formula W.sub.9 Nb.sub.8 O.sub.47. The device comprises an ion source and a source of an electrical field which may be reversible so as to produce coloring and bleaching of the electrochromic material. Due to high corrosion resistance of such material, the ion source may conveniently be a hydrous electrolyte.
Claims8
An electro-optical device comprising an electrochromic material, an electrolyte ion source in contact with at least a portion of a surface of said material, and means for producing an electric field across said portion to induce color change in said electrochromic material CHARACTERIZED IN THAT said material consists essentially of a single or polycrystalline tungsten niobate represented by the formula (9WO.sub.3).sub.1+X (4Nb.sub.2 O.sub.5).sub.1-X where X is a number in the range of -0.02 to +0.02.
Dependencies are inferred from the claim text.