Electrospun fibrous diphenyl sulfoxide incorporated polymer films for enhanced anti-counterfeiting

We report ultraviolet stimuli-responsive and transmittance-tunable films containing diphenyl sulfoxide rare earth complex for luminescence and optical anti-counterfeiting. The films are a small amount of diphenyl sulfoxide rare earth complex. The low dose of the rare earth complex still emitted strong luminescence intensity in the fibrous films. The fibrous nature of the films makes them flexible, tailorable, printability, and uniform distribution of luminescence rare earth complex, while the incorporation of PAN make the TPU film with tunable transmittance. The obtained hybrid flexible film shows strong red and green anti-counterfeiting performance under UV light stimulation due to a perfect match between the triplet energy level of DPhSO and the excited energy level of rare earth ions (Tb, Sm, Eu). Notably, the fibrous films offer multiple anti-counterfeiting modes, providing a range of verification options. This work demonstrated a low-cost and effective way to prepare anti-counterfeiting film, making them highly promising for practical anti-counterfeiting applications.