Photo- and Radiochromic Properties of Diarylethene Films with Surface Functionality

Diarylethene, 2-bis [2-methyl-5-(5-trimethylsilylthiophen-2-yl) thiophen-3-yl]-3, 3, 4, 4, 5, 5-hexafluorocyclopentene, films were fabricated by the conventional vacuum deposition method, and evaluated for their photochromic and radiochromic properties.The absorbance at 620 nm was increased by 365 nm UV exposure and decreased by visible light exposure at 550 nm.In the colorless state, crystallization was observed on the film surface kept at 50 for 1 day.In contrast, no such crystallization was observed in the colored state.The absorbance at 310 nm decreased upon X-ray exposure to the colorless film.The colorless state showed a linearity between the absorbance and X-ray dose, and the measurable dynamic range was 0.1-1000 mGy.