Photochromic compounds
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<Photochromic Compounds> * Photochromism is a phenomenon in which two states with different absorption spectra undergo reversible isomerization due to light irradiation, accompanied by a change in the color of the substance. * Photochromic compounds that exhibit this phenomenon are expected to be applied as dimming materials, optical memory materials, and holographic materials, and are actively being researched. * Among photochromic compounds, there are P-type compounds that return to their original structure after a change in molecular structure due to light irradiation, and T-type compounds that return to their original structure through thermal reactions. * In T-type photochromic compounds, the thermal decolorization reaction from the colored state takes several minutes at room temperature, and there has been a demand for further acceleration of the photochromic reaction.
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