Yellow tungsten oxide nano particles for producing heat-insulating energy-saving glass is a kind of photochromic material - a class of material that can undergo color change after being excited by a light source, with excellent photochromic performance. When it comes to photochromism, the commercial application of the first successful photochromic material began in the 1960s. Two materials scientists in the United States first discovered the reversible photochromic properties of silver halide-containing glass. Later, due to its high cost and complicated processing technology, it was not suitable for manufacturing large-area glass, and therefore its commercial application in the construction field was limited.
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At that time, scientists found that tungsten trioxide also has photochromic properties, and began research on nano WO3 materials. Now, smart glass of nano particle size tungsten trioxide is moving toward commercial applications in the construction field. So, what is photochromism? Specifically, photochromism means that when a specific wavelength of light is irradiated on Compound A, a specific chemical reaction occurs, a product B with a structural and spectral property greatly different from that of Compound A generated. When another specific wavelength of light or heat acts on the compound B, B reversibly produces the phenomenon of the compound A.
