Chromogenics Ab

Claes Göran Granqvist

Richard Karmhag

Andris Azens

Greger Gustavsson

Gunnar A Niklasson

Nuru R Mlyuka

An electrochromic device () comprises a layered structure () having an ion conducting electrolyte layer (). The ion conducting electrolyte layer () in turn comprises particles () absorbing electromagnetic radiation. The particles () are electrically conducting. The particles have a main light absorption above 700 nm.

Electrochromic device

In a method for manufacturing of thermochromic material, a target increased luminous transmittance level for the thermochromic material is determined (). The luminous transmittance level is defined within a predetermined wavelength region. Preferably, this predetermined wavelength region at least partly comprises visible light. A concentration level of a first dopant element is determined () for generating the luminous transmittance level of the thermochromic material. The first dopant element is capable of forming an oxide having a high bandgap in its electronic structure, and in a specific embodiment is Al and/or Mg. A VO-based thermochromic material is doped () with the determined concentration level of the first dopant element. At least one second dopant may also be employed.

Thermochromic material and fabrication method

An optical device () includes a first transparent substrate (), a thermochromic device () covering a surface () of the first transparent substrate (), a second transparent substrate (), an electrochromic device () covering a surface () of the second transparent substrate () and a thermally insulating volume () separating the first transparent substrate () and the second transparent substrate (). The thermally insulating volume () is preferably a vacuum volume or a volume () filled with gas.

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Uppsala, Sweden

Claes Göran Granqvist