Physical unclonable functions generated through chemical methods for anti-counterfeiting

Arppe, Riikka; Sørensen, Thomas Just

doi:10.1038/s41570-017-0031

Cited by 481 publications

(498 citation statements)

References 125 publications

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“…The growing field of counterfeiting technology has led to an increasing demand for high level anti‐counterfeiting, necessitating the development of material science. Photoluminescent (PL) materials exhibiting PL switching properties in response to external stimuli, such as light, heat, pressure, and chemical species, have attracted much attention owing to their potential applications in anti‐counterfeiting .…”

Section: Figurementioning

confidence: 99%

Hybrid Chloroantimonates(III): Thermally Induced Triple‐Mode Reversible Luminescent Switching and Laser‐Printable Rewritable Luminescent Paper

et al. 2019

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Two hybrid chloroantimonates(III), [Bzmim]3SbCl6 (1, Bzmim=1‐benzyl‐3‐methylimidazolium, Tm1=410 K) and [Bzmim]2SbCl5 (2, Tm2=348 K) are presented. 1 exhibits green emission (quantum efficiency of 87.5 %); 2 exhibits blue and red emissions under the irradiation of 310 and 396 nm light, respectively. Using different cooling methods, crystalline 1 and IL@2 (IL=ionic liquid of [Bzmim]Cl) could be generated from the molten 1. Reversible structural and PL transformation triggered by moisture or heat was observed between 1 and IL@2. Such PL switching, combined with the crystallization‐induced PL properties of 1 and 2, resulted in the firstly reported triple‐mode reversible PL switching, that is, on–off (T>Tm1), color switching (T

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Section: Figurementioning

confidence: 99%

Hybrid Chloroantimonates(III): Thermally Induced Triple‐Mode Reversible Luminescent Switching and Laser‐Printable Rewritable Luminescent Paper

et al. 2019

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“…Data security has important economic implications and is also a threat to health and national security . Room‐temperature phosphorescence (RTP) materials have attracted growing attention in the construction of optical security devices because of their unique singlet–triplet process and long‐lived luminescence .…”

Section: Introductionmentioning

confidence: 99%

Self‐Protective Room‐Temperature Phosphorescence of Fluorine and Nitrogen Codoped Carbon Dots

Peng

Feng

Chen

et al. 2018

Adv Funct Materials

319

218

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The unstable triplet excited state is a core problem when developing selfprotective room temperature phosphorescence (RTP) in carbon dots (CDs). Here, fluorine and nitrogen codoped carbon dots (FNCDs) with long-lived triplet excited states, emitting pH-stabilized blue fluorescence and pHresponsive green self-protective RTP, are reported for the first time. The self-protective RTP of FNCDs arises from n-π * electron transitions for CN/CN bonds with a small energy gap between singlet and triplet states at room temperature. Moreover, the interdot/intradot hydrogen bonds and steric protection of CF bonds reduce quenching of RTP by oxygen at room temperature. The RTP emission of FNCDs shows outstanding reversibility, while the blue fluorescence emission has good pH stability. Based on these FNCDs, a data encoding/reading strategy for advanced anticounterfeiting is proposed via time-resolved luminescence imaging techniques, as well as steganography of complex patterns.

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“…Meanwhile, anticounterfeit technology plays an indispensable role in protecting high value merchandise, legal documents, identity cards, pharmaceuticals, and currency . The two key features for anticounterfeiting applications are 1) the optical properties of the constituting materials, primarily originating from the chemical components used in the ink, and 2) the complexity of the coded patterns . Security inks have been fabricated using inorganic semiconductor nanocrystals, organic dyes, metal nanoclusters and complexes, carbon dots, rare‐earth‐doped complexes, and up‐conversion nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

Liu

Nattestad

Naficy

et al. 2019

Advanced Optical Materials

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Increasing demands for optical anticounterfeiting technology require the development of versatile luminescent materials with tunable photoluminescence properties. Herein, a number of fluorescent carbon‐ and oxygen‐doped hexagonal boron nitride (denoted as BCNO) phosphors are found to offer a such high‐tech anticounterfeiting solution. These multicolor BCNO powders, developed in a two‐step process with controlled annealing and oxidation, feature rod‐like particle shape, with varied luminescence properties. Studies of the optical properties of BCNO, along with other characterization, provide insight into this underexplored material. Anticounterfeiting applications are demonstrated with printed patterns which are indistinguishable to the naked eye under visible light but become highly discernible under UV irradiation. The fabricated patterns are demonstrated to be both chemically stable in corrosive environments and physically robust in mechanical bending testing. These properties render BCNO as promising and versatile anticounterfeiting material a wide variety of environments.

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Physical unclonable functions generated through chemical methods for anti-counterfeiting

Cited by 481 publications

References 125 publications

Hybrid Chloroantimonates(III): Thermally Induced Triple‐Mode Reversible Luminescent Switching and Laser‐Printable Rewritable Luminescent Paper

Hybrid Chloroantimonates(III): Thermally Induced Triple‐Mode Reversible Luminescent Switching and Laser‐Printable Rewritable Luminescent Paper

Self‐Protective Room‐Temperature Phosphorescence of Fluorine and Nitrogen Codoped Carbon Dots

Fluorescent Carbon‐ and Oxygen‐Doped Hexagonal Boron Nitride Powders as Printing Ink for Anticounterfeit Applications

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