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Electrochromic infrared tunable filter and emissivity modulator

  • US 7,265,890 B1
  • Filed: 08/18/2006
  • Issued: 09/04/2007
  • Est. Priority Date: 06/20/2006
  • Status: Active Grant
First Claim
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1. An electrochromic device for controlling emissivity from a body in a spectral region comprising wavelengths between about five and thirty microns, the device comprising a substrate abutting the body when the device is in use, the substrate having a plurality of vacuum-deposited thin films disposed thereon, the thin films comprising at least:

  • a substrate electrode deposited directly on the substrate;

    a plurality of active layers comprising at least an electrochromic layer, an electrolyte layer and an ion storage portion, the plurality of active layers characterized by a transmittance in the spectral region that is controllable by application of a voltage across the plurality of active layers; and

    a substantially transparent silver layer distal from the substrate;

    wherein the ion storage portion comprises one of;

    a dual layer structure having a first layer comprising vanadium pentoxide and a second layer, distinct from the first layer, comprising brown praseodymium oxide; and

    a mixed metal oxide layer comprising vanadium and praseodymium and a diffusion barrier layer comprising one of a transparent conducting oxide and praseodymium oxide, wherein the diffusion barrier layer is selected to prohibit diffusion of the silver into the layer comprising vanadium pentoxide.

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