Add time:07/25/2019         Source:sciencedirect.com

Stimuli-responsive organic luminescent materials have attracted increasing attention for their specific chemical and physical properties and potential application in many fields, such as sensing materials, optoelectronic devices and security papers. In this work, we designed and synthesized three new organic smart materials with dimethylamino naphthalene and cyanostyrene moieties. These fluorescent molecules show solvatochromic properties. With solvent polarity increased, their fluorescent emissions are red shifted. These molecules also exhibited aggregation-induced emission enhancement properties. The emission wavelength of these materials in solid state was red-shifted upon stimuli with external mechanic force, which could be recovered after addition of dichloromethane solvent. The PXRD and DSC experiments revealed that the mechanochromic properties could be ascribed to the phase transition between crystalline and amorphous states. The switch of optical properties of these molecules under acid stimuli was also studied. The fluorescent emissions show blue-shifted when exposed to trifluoroacetic acid, and these organic materials were further utilized as security ink.

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