Electrochromism

The term Electrochromism one summarizes the ability of molecules and crystals to change their optical properties by an external electric field or a current flow. Basis is the influence of electron states. Typically one finds strong electrochromic effects with some transition metal oxides (eg, tungsten ), complexes (such as Prussian blue ), and some conductive polymer. In conducting polymers, the polymer backbone can be reversibly oxidized and reduced electrochemically, in thin layers, the color of the conductive polymer is dependent on the oxidation state (examples are 3,4- ethylenedioxythiophene ( PEDOT ) and polyaniline ).

Application Examples

Electrochromism, for example, used in the energy management of houses in the form of thin layers on the window glass. These can vary their optical properties and darken example, depending on the environmental conditions (see electrochromic glass).

Electrochromic rearview mirrors are offered for motor vehicles, reducing the driver's glare at night.