pH-responsive hybrid materials with dynamic photoluminescence for anti-counterfeiting, encryption and biogenic amines detection

Thanks to the superior performance and convenience for preparation and operation, programmable memory materials have drawn extensive attention as the ever-higher requirements for anti-counterfeiting. In this work, a lanthanide-doped pH-responsive luminescent sensor ([email protected][Eu(Phen)2]-PFX, MMT = montmorillonite, PFX = pefloxacin) was prepared to achieve reversible multicolor luminescence conversion (from blue to red) by changing the pH of the solution, and thus brought about the designation of a portable test strip for biogenic amines detection. Moreover, multiple encryption and decryption of confidential information can be materialized by combining the sensor with digital code and Morse code. Additionally, the optical memory device [email protected] [Eu(Phen)2][email protected] (CS = chitosan) enabled reversible switching of sol-gel and emission colors synchronously during acid-base conversion. Hence, this smart fluorescent material can be widely applied in the fields of information security and biogenic amines detection for the future.