Journal
MATERIALS TODAY PHYSICS
Volume 21, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2021.100520
Keywords
Upconversion; Multicolor emission; Anti-Counterfeiting; Optical multiplexing
Funding
- National Natural Science Foundation of China [21773200, 12004093]
- Research Grants Council of Hong Kong [11205219, RFS2021-1S03]
- Natural Science Foundation of Hebei Province [A2021201043]
- Science and Technology Project of Hebei Education Department [QN2021018]
- Advanced Talents Incubation Program of the Hebei University [521000981342]
- Hong Kong Scholars Program [XJ2020011]
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Upconversion luminescence converts near-infrared excitation into ultraviolet and visible emissions, providing high-security optical codes for anti-counterfeiting applications with great potential.
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. (C) 2021 Elsevier Ltd. All rights reserved.
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