Facile synthesis and screen printing of dual-mode luminescent NaYF<sub>4</sub>:Er,Yb (Tm)/carbon dots for anti-counterfeiting applications

Li, Mengxiao; Yao, Weijing; Liu, Jun; Tian, Qingyong; Liu, Li; Ding, Jun; Xue, Qianqian; Lü, Qiang; Wu, Wei

doi:10.1039/c7tc01585b

Cited by 142 publications

(74 citation statements)

References 47 publications

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“…Highly dispersible in water CDs were easily mixed homogenously with water-based specific resins, and the final product was printed on several substrates (e.g., paper and plastic) or deposited on glass, with high homogeneity, and showed excellent photoluminescence, which remained after the evaporation of the solvent, in the solid printed material. Up to now, there are only a few reports in the literature that have used fluorescent inks for printing methods, most of them for anti-counterfeiting applications [19][20][21][22][23][24][25][26]. However, for the first time, CDs are used for the preparation of gravure printing ink.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Carbon Dots Ink for Gravure Printing

Koutsioukis

Belessi

Georgakilas

2019

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In the present article, we describe the use of highly fluorescent carbon dots (CDs) for the preparation of an effective water-based carbon dot ink (CD-ink) for gravure printing. Carbon dots were prepared hydrothermally from citrate and triethylenetetramine, and mixed properly with certain resins that are used in gravure inks. The as-produced CD gravure ink was used successfully for printing high quality fluorescent images.

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Section: Introductionmentioning

confidence: 99%

Fluorescent Carbon Dots Ink for Gravure Printing

Koutsioukis

Belessi

Georgakilas

2019

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“…For comparison, the UC emission spectra of naked UCNs‐R, UCNs‐G and UCNs‐B cyclohexane solutions with the same concentration (10 mg mL −1 ) were detected under the excitation of different laser power densities (Figure S4a–c, Supporting Information). The relationship between UC fluorescence intensity and the laser power densities of 980 nm is I UC ∝ ( I NIR ) n , where n refers to the number of photons . The slopes of logarithmic curves in Figure d,e indicate that the number of photons absorbed by UCNs‐R/D‐R and UCNs‐G/D‐R during the luminescence process are all ca.…”

Section: Resultsmentioning

confidence: 96%

Designing Multicolor Dual‐Mode Lanthanide‐Doped NaLuF₄/Y₂O₃ Composites for Advanced Anticounterfeiting

Xiao

Yao

Wang

et al. 2019

Advanced Optical Materials

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of consumers, because the counterfeit products are usually use inferior and can contain harmful raw materials. [5] Thus, it is critical to develop more safe anticounterfeiting techniques that are easy to identify and difficult to imitate. [6] In recent years, owing to the vigorous development of science and technology, various kinds of anticounterfeiting techniques have emerged, [7][8][9] such as barcodes, [10] radio frequency identification technology, [11] laser holograms, [12] and watermarks, [13] which can effectively combat counterfeiting and safeguard brand holders. Unfortunately, the easy duplication features and high manufacturing costs of these anticounterfeiting technologies limit their applications. Owing to tunable and customizable optical properties, low-cost and reliable luminescent materials have attracted considerable attention in anticounterfeiting fields. [14] A group of fluorescent materials have been developed and applied in the information security and anticounterfeiting fields that can emit visible light under the excitation of an ultraviolet (UV) lamp or a near-infrared (NIR) laser. [15][16][17] High-performance fluorescent materials mainly include Ln 3+ -doped materials, [14,18] carbon dots, [19,20] quantum dots, [21][22][23] plasmonic materials, [24] metal-organic frameworks, [25,26] etc. Compared to other fluorescent materials, Ln 3+ -doped fluorescent materials have emerged as a promising candidate because of their intrinsic multicolor luminescent properties, long fluorescence lifetime, excellent photochemical stability, and good biocompatibility. [18,27,28] There are two main fluorescent conversion modes in Ln 3+ -doped luminescent materials: upconversion (UC) and downconversion (DC). [1,29] Ln 3+ -doped UC materials can convert multiple low-energy photons (in the NIR region) into a high-energy photon, achieving visible light output. [30,31] The color of the UC emission light can be conveniently modulated by doping different kinds of Ln 3+ or changing the doping concentration of the activator. Recently, UC fluorescent composites emitting red-green-blue (RGB) light have been successfully prepared, and panchromatic displays have been implemented by mixing them in a certain proportion. [29,31,32] Even with great advantages, single-mode anticounterfeiting technology based on UC materials is still unsafe because it is easy to imitate by using other chemicals. Therefore, there is an urgent requirement for exploiting dual-mode or multimode anticounterfeiting Owing to the large coding capacity and high confidentiality, dual-mode or multimode anticounterfeiting fluorescent materials are gradually substituting traditional single-mode fluorescent materials. Herein, a facile hydrothermal method is designed and used to integrate lanthanide ion (Ln 3+ )-doped NaLuF 4 nanoparticles with Y 2 O 3 -based downconversion nanorods, achieving the construction of dual-mode luminescent composite materials. The excellent optical properties of NaLuF 4 /Y 2 O 3 composites are confirmed by photoluminescence spect...

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“…In the past several decades, several luminescent inks have been developed to fight with forgers, such as carbon quantum dot inks and up‐conversion luminescent inks. However, the carbon quantum dot inks have the disadvantages of poor luminescent emission and broad emission peaks, making it easy to be duplicated . In comparison, up‐conversion luminescent inks can emit bright color with narrow emission peaks, which are based on very expensive lanthanide elements, which limits its practical applications .…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the PQDs owe the advantages of wide color gamut and high quantum yields of 86.6% (Figure S1, Supporting Information), which make it potential material for display, solar cells, light‐emitting diodes (LEDs), lasing, photodetectors, anticounterfeiting and security printing . Moreover, the applications of fluorescent inks are mostly based on screen printing, which is easy‐conducted practical applications . Inkjet printing owes the merits of high spatial resolution and flexibility, making it a potential technology in printed electronics and anticounterfeiting .…”

Section: Introductionmentioning

confidence: 99%

Printable Monodisperse All‐Inorganic Perovskite Quantum Dots: Synthesis and Banknotes Protection Applications

Wang

Yao

Tian

et al. 2018

Adv Materials Technologies

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All‐inorganic perovskite quantum dots (PQDs) have drawn great attention recently, which are newcomer materials for banknotes protection. Herein, CsPbX3 (X = Cl, Br, I) PQDs are synthesized via one‐step hot‐injection method. It is interesting to find that the fluorescent colors can be tuned over wide visible spectra region of 506 and 636 nm by changing the ratio of halide ions. Then, the PQDs with strong fluorescence intensity, narrow full width at half maximum of 15–35 nm, and high quantum yields of 86.6% are formulated as fluorescent anticounterfeiting inks. Finally, the designable patterns are successfully printed on paper, polyethylene terephthalate, and banknotes by multiple printing techniques, including screen printing, inkjet printing, and roll‐to‐roll printing. The desired printed patterns are colorless under visible light but exhibit bright red, green, and cyan color outputs when exposed to 365 and 254 nm light. Moreover, the polydimethylsiloxane film of PQDs still emits bright color outputs even after 60 days. The excellent dual‐modal fluorescent properties make PQDs potential candidates in the field of banknotes protection.

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Facile synthesis and screen printing of dual-mode luminescent NaYF₄:Er,Yb (Tm)/carbon dots for anti-counterfeiting applications

Abstract: A printed invisible QR code pattern could be identified with green and blue colors under 980 nm and 365 nm light excitation, respectively.

Cited by 142 publications

References 47 publications

Fluorescent Carbon Dots Ink for Gravure Printing

Fluorescent Carbon Dots Ink for Gravure Printing

Designing Multicolor Dual‐Mode Lanthanide‐Doped NaLuF₄/Y₂O₃ Composites for Advanced Anticounterfeiting

Printable Monodisperse All‐Inorganic Perovskite Quantum Dots: Synthesis and Banknotes Protection Applications

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Facile synthesis and screen printing of dual-mode luminescent NaYF4:Er,Yb (Tm)/carbon dots for anti-counterfeiting applications

Abstract: A printed invisible QR code pattern could be identified with green and blue colors under 980 nm and 365 nm light excitation, respectively.

Cited by 142 publications

References 47 publications

Fluorescent Carbon Dots Ink for Gravure Printing

Fluorescent Carbon Dots Ink for Gravure Printing

Designing Multicolor Dual‐Mode Lanthanide‐Doped NaLuF4/Y2O3 Composites for Advanced Anticounterfeiting

Printable Monodisperse All‐Inorganic Perovskite Quantum Dots: Synthesis and Banknotes Protection Applications

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Product

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About

Facile synthesis and screen printing of dual-mode luminescent NaYF₄:Er,Yb (Tm)/carbon dots for anti-counterfeiting applications

Designing Multicolor Dual‐Mode Lanthanide‐Doped NaLuF₄/Y₂O₃ Composites for Advanced Anticounterfeiting