The smart window glass of pvd coating machine is a kind of smart film with electrochromic, Photochromism, Thermochromism, and photochromic properties.

There are many types of smart window glass films, including W03, NiO, VO2, and TiO2 according to their composition; According to the cause of color change, there are electrochromism, Photochromism, Thermochromism, and gas induced color change. W03 thin film is one of the first reversible inorganic chromogenic materials found. It has good electrochromic (caused by the double injection of small cation cation electrons), Photochromism (caused by ultraviolet radiation) and gas photochromic properties.

W03 thin film is a typical cathode electrochromic material. The newly prepared original state W03 film is a light yellow translucency film. During the discoloration process, the color darkens during coloring, changing from light blue to deep blue, and returns to a transparent state when fading. The electrochromic voltage applied to the W03 film is 3V. After doping with MoO3, the color of W03 can be changed, making it more suitable for sensitive areas of the human eye. The landing voltage is -1.7V, and the fading voltage is -1.9V. The structure of the W03 thin film photochromic window is simple, and it can achieve continuous control and adjustment of visible and near-infrared radiation transmittance over a larger range. The adjustment rate is between 5% and 75% in the visible light section.
Seal the four sides of two glass plates coated with W03 film and reserve ventilation holes to create a medium air photochromic window. Connect hydrogen and argon gas (with a hydrogen content of 5%) until the color window turns blue; Breath in oxygen until the color window fades.
The intelligent window glass W03 thin film plating process adopts intermediate frequency power supply and twin unbalanced magnetron sputtering technology.
Performance testing: The discoloration reaction of the film was carried out in a self-made two electrode electrochemical tank, with ITO glass coated with W03 film as one electrode and another ITO film as the corresponding electrode. 1moL/L LiC104/PC was used as the electrolyte, and a voltage of 3V was applied between the two electrodes. The coloring and fading of the film were controlled by changing the polarity of the voltage.