Durable electrooptic devices comprising ionic liquids

US6961168B2 · kind B2 · utility

Assignee

• The Regents of the University of California · US

Inventors

• Anoop Agrawal · Tucson, US
• John P. Cronin · Tucson, US
• Juan C. L. Tonazzi · Tucson, US
• Benjamin P. Warner · Los Alamos, US
• T. Mark McCleskey · Los Alamos, US
• Anthony K. Burrell · Los Alamos, US

Key dates

• Filing date: Dec 19, 2003
• Grant date: Nov 1, 2005
• Expiry date: Jan 12, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F2202/36
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Electrolyte solutions for electrochromic devices such as rear view mirrors and displays with low leakage currents are prepared using inexpensive, low conductivity conductors. Preferred electrolytes include bifunctional redox dyes and molten salt solvents with enhanced stability toward ultraviolet radiation. The solvents include lithium or quaternary ammonium cations, and perfluorinated sulfonylimide anions selected from trifluoromethylsulfonate (CF3SO3−), bis(trifluoromethylsulfonyl)imide ((CF3SO2)2N−), bis(perfluoroethylsulfonyl)imide ((CF3CF2SO2)2N−) and tris(trifluoromethylsulfonyl)methide ((CF3SO2)3C−). Electroluminescent, electrochromic and photoelectrochromic devices with nanostructured electrodes include ionic liquids with bifunctional redox dyes.