Electrochromic tin oxide
First Claim
1. An electrochromic device comprising a layer of electrochromic material in contact with an ion-supplying electrolyte layer and conductors for applying an electrical potential across an interface between said layer of electrochromic material and said ion-supplying electrolyte layer, where in said electrochromic material comprises doped tin oxide particles.
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Abstract
Tin oxide doped with an electrochromically effective amount of a metal, e.g. antimony or niobium, which provides a color change when the doped tin oxide is exposed to an electrochemical potential in the presence of mobile ions. Particles of electrochromic doped tin oxide, e.g. coated on a white or pastel pigment substrate, have a contrast ratio greater than 1.2, where contrast ratio is a measure of electrochromic functionality of a material and is the ratio of reflectance of the material in an oxidized state to the color of the material in a reduced state and where color is a photodiode measurement of the value of light reflected off the oxidized or reduced material from a constant source of light shining on the material. Such doped tin oxide-containing particles are useful as electrochromic material in display devices.
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Citations
4 Claims
- 1. An electrochromic device comprising a layer of electrochromic material in contact with an ion-supplying electrolyte layer and conductors for applying an electrical potential across an interface between said layer of electrochromic material and said ion-supplying electrolyte layer, where in said electrochromic material comprises doped tin oxide particles.
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3. A method of producing an electrochromic contrast ratio greater than 1.2 by applying an electrochemical potential to doped tin oxide particles in contact with mobile ions.
Specification