Cesium tungsten bronze is widely used to prepare building energy saving coating because it can effectively suppress the solar heat gain of buildings and the energy consumption of air conditioning. And it is due to the high visible light transmittance and excellent near-infrared light (NIR) shielding performance of the nano powder of cesium tungsten bronze (CsxWO3, such as Cs0.33WO3). So, do you know why Cs0.33WO3 can transmit visible light? And why can Cs0.33WO3 shield near-infrared light?
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The reason why Cs0.33WO3 can transmit visible light is that Cs0.33WO3 nano particles have a wide band gap (~ 2.6eV). At the same time, the cesium ions embedded in the material will introduce free electrons into the band, giving cesium tungsten bronze a strong conductivity and pentavalent tungsten ions, resulting in local plasmon resonance absorption and small polaron absorption mechanisms, so it can shield near infrared light.
