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US 10,647,913 B2Granted
Photochromic-electrochromic compositions
AssigneeSwitch Materials, Inc.
InventorsNeil Robin Branda, Glen Ramsay Bremner, Jeremy Graham Finden, Matt Andrew Pilapil, Matthew Neal Roberts, Jonathan Ross Sargent, James Daniel Senior, Veronica Elizabeth Patricia Marshman, Natalie E. Campbell
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Abstract
A composition comprising a diarylethene photochromic anodic species, a cathodic species and an electrolyte that comprises a supporting electrolyte and a solvent. Electrochromic devices such as optical filters are prepared from such compositions.
Claims18
A composition comprising:
- (a) a first photochromic anodic species, wherein the first photochromic anodic species is a diarylethene, reversibly convertible between ring-closed and ring-open isomers;
- (b) a cathodic species, wherein the cathodic species comprises a viologen, a substituted viologen, a phenazinium, a substituted phenazinium, a ferrocenium or a substituted ferrocenium salt, and wherein the cathodic species has a reduction potential at least 600 mV less anodic than a ring-closed oxidation potential of the first photochromic anodic species;
- and
- (c) an electrolyte, wherein the electrolyte comprises:
- (i) a supporting electrolyte;
- and
- (ii) a solvent portion comprising one or more solvents.
4 more elements
An optical filter comprising:
- (a) a first substantially transparent substrate and a second substantially transparent substrate;
- (b) a first electrode disposed on a surface of the first substantially transparent substrate;
- (c) a second electrode disposed on a surface of the second substantially transparent substrate;
- (d) a cathodic material disposed on a surface of the first electrode, wherein the cathodic material comprises a viologen, a substituted viologen, a phenazinium, a substituted phenazinium, a ferrocenium or a substituted ferrocenium salt, and wherein the cathodic material has a reduction potential at least 600 mV less anodic than a ring-closed oxidation potential of a first photochromic anodic species;
- and
- (e) a layer of switching material disposed between the first substantially transparent substrate and the second substantially transparent substrate and in contact with the first electrode and the second electrode, the layer of switching material comprising:
- (i) at least one photochromic anodic species, wherein the first photochromic anodic species of the at least one photochromic anodic species is a diarylethene, reversibly convertible between ring-closed and ring-open isomers;
- and
- (ii) an electrolyte comprising a supporting electrolyte and a solvent portion comprising one or more solvents;
- and
- wherein the cathodic material is insoluble in the layer of switching material.
8 more elements
Dependencies are inferred from the claim text.