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Electrochromic devices

  • US 9,738,140 B2
  • Filed: 07/31/2015
  • Issued: 08/22/2017
  • Est. Priority Date: 08/04/2014
  • Status: Active Grant
First Claim
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1. An electrochromic device comprising:

  • a first substantially transparent substrate;

    second substantially transparent substrate substantially parallel to the first substantially transparent substrate and spaced apart therefrom; and

    an electrochromic medium disposed between the first substantially transparent substrate and the second substantially transparent substrate;

    wherein;

    the electrochromic device is configured to exhibit a contrast ratio of at least 20,000;

    1, a darkening time less than about 30 seconds, and a clearing time of less than about 150 seconds; and

    the electrochromic medium comprises;

    an anodic electroactive material; and

    a cathodic electroactive material comprising a N,N′

    -dialkyldipyridinium compound.

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