Electrochromic media with concentration-enhanced stability, process for the preparation thereof and use in electrochromic devices

  • US 6,137,620 A
  • Filed: 04/30/1999
  • Issued: 10/24/2000
  • Est. Priority Date: 04/30/1999
  • Status: Active Grant
First Claim
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1. An electrochromic medium, comprising:

  • a) a solventb) an anodic electroactive material which exhibits at least two chemically reversible waves in a cyclic voltammogram in said solvent at room temperature,c) a cathodic electroactive material which exhibits at least two chemically reversible waves in a cyclic voltammogram in said solvent at room temperature;

    wherein at least one of said electroactive materials is electrochromic, and wherein the electroactive material having the smaller potential difference between the chemically reversible waves has a concentration in the electrochromic medium greater than that required to achieve a balanced concentration.

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