Phase and photoluminescence analysis of dual-color emissive Eu3+-doped ZrO2 nanoparticles for advanced security features in anti-counterfeiting

King, Abhishek; Singh, Rahul; Nayak, Bibhuti B.

doi:10.1016/j.colsurfa.2021.127715

Cited by 25 publications

(13 citation statements)

References 101 publications

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“…The observed luminescence spectrum of the synthesized NPs resulted from transition within the f-electron of the Eu 3+ ions. The observed peaks in the optical range were related to the Eu 3+ forbidden electric-dipole and magnetic-dipole 4f → 4f ( 5 D 0 → 7 F J = 0,1,2,3,4 ) transitions (as shown in Figure 5 b) which strongly depend on the symmetry of the Eu 3+ sites [ 39 , 40 , 41 ]. While magnetic-dipole 5 D 0 → 7 F 1 (λ = 591 nm) and 5 D 0 → 7 F 4 (λ = 698 nm) transitions are relatively insensitive to the environment, low intensity of electric-dipole transition 5 D 0 → 7 F 2 (λ = 617 nm) as well as the absence of the 5 D 0 → 7 F 0 transition could be a sign of high symmetry of the Eu 3+ site in the synthesized materials.…”

Section: Resultsmentioning

confidence: 98%

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BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Gadzhimagomedova

Polyakov

Панкин

et al. 2021

IJMS

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X-ray photodynamic therapy (XPDT) has been recently considered as an efficient alternative to conventional radiotherapy of malignant tissues. Nanocomposites for XPDT typically consist of two components—a nanophosphor which re-emits X-rays into visible light that in turn is absorbed by the second component, a photosensitizer, for further generation of reactive oxygen species. In this study, BaGdF5 nanophosphors doped with different Eu:Gd ratios in the range from 0.01 to 0.50 were synthesized by the microwave route. According to transmission electron microscopy (TEM), the average size of nanophosphors was ~12 nm. Furthermore, different coatings with amorphous SiO2 and citrates were systematically studied. Micro-CT imaging demonstrated superior X-ray attenuation and sufficient contrast in the liver and the spleen after intravenous injection of citric acid-coated nanoparticles. In case of the SiO2 surface, post-treatment core–shell morphology was verified via TEM and the possibility of tunable shell size was reported. Nitrogen adsorption/desorption analysis revealed mesoporous SiO2 formation characterized by the slit-shaped type of pores that should be accessible for methylene blue photosensitizer molecules. It was shown that SiO2 coating subsequently facilitates methylene blue conjugation and results in the formation of the BaGdF5: 10% Eu3+@SiO2@MB nanocomposite as a promising candidate for application in XPDT.

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Section: Resultsmentioning

confidence: 98%

“…Rare-earth metal ions such as Eu 3+ doped into a wide range of materials exhibit optical luminescence upon UV–vis and X-ray excitation [ 13 , 20 , 38 , 39 ]. The latter makes it possible to convert ionizing radiation into visible light as part of the XPDT system.…”

Section: Resultsmentioning

confidence: 99%

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Gadzhimagomedova

Polyakov

Панкин

et al. 2021

IJMS

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“…Zirconium oxide (ZrO 2 ) is an intensively studied and used material due to its many remarkable physical and chemical properties. It has a high melting point (2700 • C), high hardness (between 11 and 18 GPa depending on the phase) [1,2], good chemical resistance [2,3], biocompatibility [4], high refractive index (2.1 at 633 nm) [5], wide band gap (5 eV) [6], high transparency in the visible and near-infrared range [7] and photoluminescence properties [8,9]. Due to its numerous properties, zirconium oxide is used in many applications such as protective coatings against corrosion, wear and oxidation [10,11], in optical applications (mirror, filters, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Due to its numerous properties, zirconium oxide is used in many applications such as protective coatings against corrosion, wear and oxidation [10,11], in optical applications (mirror, filters, etc.) [12][13][14][15], in anti-counterfeiting solutions [9] and in health applications such as the dental field [16,17].…”

Section: Introductionmentioning

confidence: 99%

Versatile Zirconium Oxide (ZrO2) Sol-Gel Development for the Micro-Structuring of Various Substrates (Nature and Shape) by Optical and Nano-Imprint Lithography

et al. 2022

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Zirconium oxide (ZrO2) is a well-studied and promising material due to its remarkable chemical and physical properties. It is used, for example, in coatings for corrosion protection layer, wear and oxidation, in optical applications (mirror, filters), for decorative components, for anti-counterfeiting solutions and for medical applications. ZrO2 can be obtained as a thin film using different deposition methods such as physical vapor deposition (PVD) or chemical vapor deposition (CVD). These techniques are mastered but they do not allow easy micro-nanostructuring of these coatings due to the intrinsic properties (high melting point, mechanical and chemical resistance). An alternative approach described in this paper is the sol-gel method, which allows direct micro-nanostructuring of the ZrO2 layers without physical or chemical etching processes, using optical or nano-imprint lithography. In this paper, the authors present a complete and suitable ZrO2 sol-gel method allowing to achieve complex micro-nanostructures by optical or nano-imprint lithography on substrates of different nature and shape (especially non-planar and foil-based substrates). The synthesis of the ZrO2 sol-gel is presented as well as the micro-nanostructuring process by masking, colloidal lithography and nano-imprint lithography on glass and plastic substrates as well as on plane and curved substrates.

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“…To obtain the maximum luminescence yield, it is necessary to correctly select the concentration of the dopant. Weak luminescence can be caused either by a too low dopant concentration or by the process of quenching the luminescence at a high concentration [ 29 , 30 , 31 , 32 ]. Another important criterion for the applicability of composites is their high biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis Optimization of BaGdF5:x%Tb3+ Nanophosphors for Tunable Particle Size

et al. 2022

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X-ray photodynamic therapy (XPDT) is aimed at the treatment of deep-located malignant tumors thanks to the high penetration depth of X-rays. In XPDT therapy, it is necessary to use materials that effectively absorb X-rays and convert them into visible radiation-nanophosphors. Rare-earth elements, fluorides, in particular, doped BaGdF5, are known to serve as efficient nanophosphor. On the other hand, the particle size of nanophosphors has a crucial impact on biodistribution, cell uptake, and cytotoxicity. In this work, we investigated various Tb:Gd ratios in the range from 0.1 to 0.5 and optimized the terbium content to achieve the maximum luminescence under X-ray excitation. The effect of temperature, composition of the ethylene glycol/water solvent, and the synthesis technique (solvothermal and microwave) on the size of the nanophosphors was explored. It was found that the synthesis techniques and the solvent composition had the greatest influence on the averaged particle size. By varying these two parameters, it is possible to tune the size of the nanophosphor particles, which make them suitable for biomedical applications.

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Phase and photoluminescence analysis of dual-color emissive Eu3+-doped ZrO2 nanoparticles for advanced security features in anti-counterfeiting

Cited by 25 publications

References 101 publications

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Versatile Zirconium Oxide (ZrO2) Sol-Gel Development for the Micro-Structuring of Various Substrates (Nature and Shape) by Optical and Nano-Imprint Lithography

Synthesis Optimization of BaGdF5:x%Tb3+ Nanophosphors for Tunable Particle Size

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