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Attractively, it can be restored to its original fluorescence through either thermal annealing at 80¡ãC for 5 min or solvent fuming with DCM. The pressure dependent emission of DMCS-TPA was further examined. A progressive change of the shape and position of fluorescence spectra with increased pressure from 2 MPa to 10 MPa was observed. As shown in Fig. 5b, application of 2 MPa induces a slight widening on the tail with little change of maximum PL wavelength. The powder pressed at 5 MPa exhibits a red shifted fluorescence at 544 nm. Adoption of 10 MPa causes a noticeable emission change by 74 nm from yellowish green to orange. The wide coverage of emissive spectra under a small load of pressure reveals the sensitive feature of DMCS-TPA towards mechanical stimuli. Whereas the sample subjected to 10 MPa is not stable at room temperature, showing a partial recovery within seconds. The mechano-chromism can be recycled many times with almost no deterio-ration, indicating its reversibility and durability.

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