Violet tungsten oxide for producing smart heat insulation coating, W18O49, can exhibit similar X-ray diffraction peaks with tungsten trioxide (WO3). Therefore, it is difficult to distinguish W18O49 and WO3 by XRD technology alone. And therefore, other experimental techniques such as selected area diffraction (SAD) and high resolution transmission electron microscopy (HRTEM) are needed to determine their chemical structure and phase composition to determine their composition.

Violet tungsten oxide for manufacturing smart heat insulation window glass is violet tungsten oxide nano powder. Finally, nano particle size violet tungsten oxide is applied on the surface of the building glass in the form of a layer of thermal insulation film. In order to ensure the good near-infrared absorption performance of the obtained thermal-insulation film, it is necessary to study the ultraviolet-visible-near-infrared absorption property of the raw material violet tungsten oxide nanoparticles and the adsorption performance of Rhodamine B dye, and the specific surface area and pore size distribution are characterized by BET test.

Violet tungsten oxide for preparing smart heat insulation film is a photochromic material. It is the violet tungsten oxide nano particles that allow common glass windows to change their color and light transmission characteristics with changes in external conditions such as sunlight, thereby achieving the purpose of heat insulation and ultraviolet resistance.

Violet tungsten oxide for producing smart window is an electrochromic material. It is the violet tungsten oxide nano powder that makes common window become an advanced technology product to dynamically regulate the transmission of solar radiant energy.