High-security anti-counterfeiting through upconversion luminescence

By Hao Suo, Qi Zhu, Xin Zhang, Bing Chen, Jiangkun Chen, Feng Wang. Materials today physics, 2021

196 citations recorded by the source corpus.

Abstract Upconversion luminescence is characterized by the conversion of near-infrared excitation into ultraviolet and visible emissions through a special class of doped optical materials. Recent advances in chemical synthesis have enabled the precise incorporation of multiple dopant ions into a single substrate of well-controlled size and morphology, which render emissions with distinguishable spectroscopic fingerprints as well as spatially and temporally resolved features. These luminescence characteristics hold great promise in anti-counterfeiting applications by encoding high-capacity optical codes. In this review, we focus on recent advances in anti-counterfeiting technology that exploits the remarkable tunability of upconversion luminescence to design optical codes with high-level security. We discuss various approaches for the design of upconversion materials and construction of upconversion codes, along with an analysis of future challenges for upconversion-based anti-counterfeiting.

Subfields: Materials Chemistry, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/e654fda01f65a40a1546d88d730074320c3b8b8c