F-doped cesium tungsten bronze may be applied for preparing smart glass as it has good visible light transmittance and near-infrared shielding properties. And it is reported that F doping cesium tungsten bronze has higher visible light transmittance and better near-infrared shielding performance than undoped cesium tungsten bronze. This is because the fluorine atom replaces the oxygen atom, increases the band gap and generates carriers.
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In this regard, experts say, what should be noted is that the W defects will occur if the erosion of hydrofluoric acid is excess, and W defects will lead to the reduction of the carrier concentration and mobility. Therefore, the near-infrared shielding performance of F doped cesium tungsten bronze with a hydrofluoric acid addition amount of F=0.79 is degraded. The F doped cesium tungsten bronze prepared by using HF with the additive amount of F=0.45 exhibited the best transparent heat insulation performance, wherein the visible light transmittance and the near-infrared shielding rate were 48% and 90%, respectively.
