High-performance sustainable polyester amide composites with persistent luminescence for multiple anti-counterfeiting

Persistent luminescence materials can find extensive applications in commodity packaging, labels, and certificates owing to their distinctive optical effects and visual appeal. Nevertheless, rising costs and complex preparation processes have hindered the further development of multi-counterfeit long afterglow materials. In this study, a series of persistent luminescence polyester amide (PEA) composites were prepared by blending bio-based PEA with persistent luminescence particles. Simultaneously, we leveraged the optical effects on the material surface and the superimposed colors theory to create a series of composite films with customizable persistent luminescence colors. By exploring various combinations, 29 distinct persistent luminescence colors were achieved from the initial three options. We also designed a multiple anti-counterfeiting film with color-coded functionality to harness the shape memory property conferred by the stretch-induced crystallization of PEA. This innovative approach transforms low-cost persistent luminescence single-counterfeiting materials into high-value multiple anti-counterfeiting products, thereby contributing to the evolution of bio-based composites. This study underscores the utilization of affordable persistent luminescence single anti-counterfeiting masterbatch, combined with the physical attributes of bio-based plastics, to create high-value multiple anti-counterfeiting materials and foster the development of bio-based industries.