Tungsten bronze has photochromic properties and can be applied to building windows films and automotive insulation films (smart glass). However, there are currently few studies on this.

Tungsten trioxide (WO₃) is an important n-type semiconductor oxide with a variety of crystal structures. It has been extensively studied due to its unique physical and chemical properties, and has been used in electrochromism, photochromism, catalysts, and sensing materials. In order to further utilize the excellent properties of WO₃ and broaden its application fields, one technical approach is to reduce its grain size, namely nanostructured tungsten oxide.

Tungsten trioxide is an inorganic electrochromic material with excellent electrochromic properties. Electrochromism refers to the phenomenon that the optical properties of a material undergo a reversible change under the action of an applied electric field, and the appearance is a reversible change in color and transparency.

Tungsten oxide is a transition metal oxide n-type semiconductor. Traditionally, tungsten oxide is applied in catalysts, electrochromism, battery electrodes, solar absorbing materials and radar absorbing materials (RAM). In recent years, scientists have focused on its applications as semiconductor materials such as heat-sensitive, pressure-sensitive and gas-sensitive material. The characteristics and applications of tungsten oxide nanocrystalline films in gas sensors, photocatalysis, photoconductivity, etc. are attracting more and more attentions, especially in the field of oxide semiconductor gas sensor applications, tungsten oxide-based material has been considered as one of the most promising new gas sensing materials for detecting NOx, SOx, NH3, H2S and, etc.