Electrochromic composition and electrochromic device using same

• US 10,294,415 B2
• Filed: 06/09/2014
• Issued: 05/21/2019
• Est. Priority Date: 06/09/2014
• Status: Active Grant

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: iGlass Technology, Inc.
• Inventors: Vasiliev, Evgeniy Vladimirovich, Borisov, Sergey Olegovich, Zaikin, Pavel Anatolievich, Kruglikov, Nikita Valerievich
• Primary Examiner(s): Ahvazi, Bijan
• Application Number:
  US14/300,216
• Publication Number:
  US 20150353819A1
• Time in Patent Office: 1,807 Days
• Field of Search: 252583, 359242, 359265, 359273
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 2001/15145 the electrochromic layer comprises a mixture of anodic and cathodic compounds
• CPC Class Codes: G02F 2001/1518 Ferrocene compounds

Abstract

Electrochromic compositions for use in devices with electrically controlled absorption of light such as light filters of variable optical density, light emission modulators, and information image displays. The described electrochromic compositions may be used, for example, for creating light-transmitting coatings of buildings for controlling indoor microclimate by regulating the flow of natural light. Specifically, described is an exemplary organic electrochromic composition that is based on biocompatible and biodegradable components and is characterized by an increased service life, a high rate of light-transmission change. The described electrochromic compositions may be prepared in a wide range of light-absorption spectra and coating colors.

Claims

1. An electrochromic composition comprising:

a solvent comprising one of propylene carbonate, N-methylpyrrolidone, polyethylene glycol, or an ester thereof;

a cathodic component in the form of a quaternary salt of dipyridine, the cathodic component comprising;

a quaternary salt comprising one of 1,1′

-dimethyl-4,4′

-dipyridinium, 1,1′

-diethyl-4,4′

-dipyridinium or 1,1′

-dibenzyl-4,4′

-dipyridinium and one of CF₃SO₃⁻

or (CF₃SO₂)₂N⁻

, the quaternary salt being present at a concentration of 0.4-0.3.6 mass % on the basis of a total mass of the electrochromic composition, and

a balance comprising the solvent;

an anodic component in the form of a ferrocene derivative, the anodic component comprising;

ferrocene or 1,1′

-diethylferrocene at a concentration of 0.3-3.0 mass %, on the basis of a total mass of the electrochromic composition, and

a balance comprising the solvent;

a polymeric thickener comprising a copolymer of methylacrylate and one of a polylactic acid or poly-3-hydroxybutyrate

at least one antioxidant comprising ionol; and

an ultraviolet filter comprising a cinnamate.

2. The electrochromic composition of claim 1, wherein the at least one antioxidant comprises a polyphenol.

3. The electrochromic composition of claim 1, wherein the at least one antioxidant comprises a sterically hindered phenol.

4. The electrochromic composition of claim 1, wherein the ultraviolet filter comprises a benzophenone.

5. An electrochromic device comprising an electrochromic composition, the electrochromic composition comprising:

a solvent comprising one of propylene carbonate, N-methylpyrrolidone, polyethylene glycol, or an ester thereof;

a cathodic component in the form of a quaternary salt of dipyridine, the cathodic component comprising;

a quaternary salt comprising one of 1,1′

-dimethyl-4,4′

-dipyridinium, 1,1′

-diethyl-4,4′

-dipyridinium or 1,1′

-dibenzyl-4,4′

-dipyridinium and one of CF₃SO₃⁻

or (CF₃SO₂)₂N⁻

, the quaternary salt being present at a concentration of 0.4-3.6 mass % on the basis of a total mass of the electrochromic composition, and

a balance comprising the solvent;

an anodic component in the form of a ferrocene derivative, the anodic component comprising;

ferrocene or 1,1′

-diethylferrocene, at a concentration of 0.3-3.0 mass % on the basis of a total mass of the electrochromic composition, and

a balance comprising the solvent;

a polymeric thickener comprising a copolymer of methylacrylate and one of a polylactic acid or poly-3-hydroxybutyrate

at least one antioxidant comprising ionol; and

an ultraviolet filter comprising a cinnamate.

6. The electrochromic device of claim 5, wherein the at least one antioxidant comprises a polyphenol.

7. The electrochromic device of claim 5, wherein the at least one antioxidant comprises a sterically hindered phenol.

8. The electrochromic device of claim 5, wherein the ultraviolet filter comprises a benzophenone.