Multi-color luminescence and anticounterfeiting application of upconversion nanoparticle

Quadruply doped (Nd 3+ , Tm 3+ , Er 3+ and Yb 3+ ) core–shell structure NaYF 4 UCNPs achieve multi-color luminescence based on a single material under 980 nm excitation. Their applicability to anticounterfeiting and information storage has been verified.