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As for mechanochromic (MC) properties, meaning that the emission can be reversibly transformed through altering of molecular packing structures upon grinding, shearing or  pressing, one of the recent goals for practical applications is improving the contrast ratio in emission intensity or wave- length. Several fluorescent on¨Coff switching materials with high contrast have been reported.However examples with a broad colour change are rather scarce at the current stage8due to the complicated requirements of both remarkable shift of PL wavelength and high solid-state emission efficiency. Tian's group obtained divinylanthracene derivatives showing more than 100 nm red-shift under high pressure, for example, above one GPa,9but relatively low pressure is preferred for applica-tions in our daily life.

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