Asahi Glass Company, Limited

Ashai Glass Company, Limited

Kenzi Matsuhiro

Yasushi Masuda

An amorphous electrochromic film prepared by vacuum evaporation under relatively high pressure of 2.times.10.sup.-4 -2.times.10.sup.-3 torr. The evaporated film is porous with packing density less than 0.65 and exhibits excellent reversibility after heat treatment at 250.degree. C.-350.degree. C. whereby it is optimum for an electrochromic device sealed with a sealant of tetrafluoroethylene-ethylene copolymer having no reactivity with electrolyte, low moisture permeability, excellent chemical properties and good adhesiveness.

Method for forming electrochromic film

An improved counter electrode used in an electrochromic device is transmissive in both charge injection and extraction states and exhibits excellent reversibility whereby it is optimum as a counter electrode in a transmissive electrochromic device which is useful as a display device in its control of visible and infrared absorption by a window and the like.

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Sagamihara, Japan

Kenzi Matsuhiro