Cs doped tungsten oxide nanoparticles for producing smart glass are also known as cesium tungsten oxide nanoparticles, cesium tungsten bronze nanoparticles or CsxWO3 nanoparticles. And such a smart glass has high transparency and excellent near infrared shielding performance. It is reported that after being exposed to UV light for 30 minutes, the color of cesium tungsten bronze nano powder changes from the original dark blue to dark purple. It indicates that photochromism has occurred.
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The study also showed that the photochromic phenomenon is not obvious, and the absorbance curve in the near infrared region fluctuates greatly. This may be because the Cs doped tungsten oxide nanoparticles have higher absorbance in the near-infrared region, but have a smaller band gap. Therefore, when UV light is radiated, a large number of free carriers are added to the CsxWO3 system, and then the absorption in the near-infrared region is further enhanced beyond the instrument's resolution range.
