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Title: Binary temporal upconversion codes of Mn2+-activated nanoparticles for multilevel anti-counterfeiting
Authors: Liu, X 
Wang, Y
Li, X 
Yi, Z 
Deng, R 
Liang, L 
Xie, X
Loong, D.T.B 
Song, S
Fan, D
All, A.H 
Zhang, H
Huang, L
Liu, X 
Keywords: lanthanide
upconversion nanoparticle
optical method
rare earth element
chemical structure
energy transfer
high throughput screening
particle size
temporal analysis
Issue Date: 2017
Publisher: Nature Publishing Group
Citation: Liu, X, Wang, Y, Li, X, Yi, Z, Deng, R, Liang, L, Xie, X, Loong, D.T.B, Song, S, Fan, D, All, A.H, Zhang, H, Huang, L, Liu, X (2017). Binary temporal upconversion codes of Mn2+-activated nanoparticles for multilevel anti-counterfeiting. Nature Communications 8 (1) : 899. ScholarBank@NUS Repository.
Abstract: Optical characteristics of luminescent materials, such as emission profile and lifetime, play an important role in their applications in optical data storage, document security, diagnostics, and therapeutics. Lanthanide-doped upconversion nanoparticles are particularly suitable for such applications due to their inherent optical properties, including large anti-Stokes shift, distinguishable spectroscopic fingerprint, and long luminescence lifetime. However, conventional upconversion nanoparticles have a limited capacity for information storage or complexity to prevent counterfeiting. Here, we demonstrate that integration of long-lived Mn2+ upconversion emission and relatively short-lived lanthanide upconversion emission in a particulate platform allows the generation of binary temporal codes for efficient data encoding. Precise control of the particle's structure allows the excitation feasible both under 980 and 808 nm irradiation. We find that the as-prepared Mn2+-doped nanoparticles are especially useful for multilevel anti-counterfeiting with high-throughput rate of authentication and without the need for complex time-gated decoding instrumentation. © 2017 The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-017-00916-7
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