Tungsten trioxide, or WO3, is an ideal discoloration material in all-solid-state electrochromic devices. Well, WO3, is also widely used in smart windows, photochromic devices and smart displays due to its excellent response speed, high coloring efficiency and high coloring/erasing contrast.
More details, please visit:
http://www.tungsten-powder.com/tungsten-oxide.html
So, what is tungsten trioxide? Tungsten trioxide is an n-type wide band gap semiconductor oxide with a band gap of about 2.8 Ev. WO3 exists as monoclinic and triclinic phases at low temperature and room temperature, while orthogonal and tetragonal phases occur at high temperature. The ideal crystal structure of WO3 can be regarded as a tungsten-oxygen octahedron [WO6] consisting of a central W atom and six O atoms surrounding the W atom, connected by a common vertex. There are many gaps between the octahedrons, forming various channels. These channels can be used for ion flow channels and embedded positions, and are good implanters for H +, Li + ions.
