Excitation wavelength-dependent emission of Mn2+/Sn2+ co-doped Cs3ZnI5 for optical fluorescence anti-counterfeiting applications

Mn 2+ and Sn 2+ co-doped Cs 3 ZnI 5 crystals synthesized via gradient cooling crystallization are used for fluorescence anticounterfeiting. It exhibits excitation-wavelength dependence and utilizes a matrix operation strategy for information encryption.