Luminescence characteristics of SrZn2(PO4)2:Mn2+ and its anti-counterfeiting application

This study has prepared SrZn₂(PO₄)₂:Mn²⁺ long afterglow luminescent materials using the high temperature solid phase method and analyzed the effects of different concentrations and calcination temperatures on the afterglow properties in the materials. The luminescence structure and properties were systematically investigated by XRD, SEM and excitation-emission spectroscopy, and the luminescence mechanism of the material was discussed. The measured values indicate that the calcination temperature has a strong influence on the luminescence color of the material. At a calcination temperature of 900 °C, the material exhibits a red luminescence, while when the calcination temperature is 600 °C, the material exhibits a blue-green luminescence. Finally, its application in dynamic anti-counterfeiting technology is analyzed. Using the multi-color afterglow luminescence characteristics of the material under different excitation wavelengths, and the different decay rates between colors, the anti-counterfeiting pattern with dynamic change characteristics is designed, which greatly improves the security of anti-counterfeiting.