Effect of hydrothermal synthesis conditions on up-conversion luminescence intensity of β-NaYF4 : Er3+, Yb3+ submicron particles

Sagaidachnaya, E. A.; Konyukhova, Julia G.; Kazadaeva, N. I.; Doronkina, A. A.; Yanina, Irina Yu.; Skaptsov, Alexander A.; Pravdin, Alexander B.; Kochubey, Vyacheslav I.

doi:10.1070/qel17205

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The UCNPs were synthesized by our variant of the hydrothermal method [24] according to the technology developed by us (Supplementary File S1). In this case, an increased concentration of citric acid was used, but the amount of sodium in the citrate composition was stoichiometric.…”

Section: Synthesis and Size Characterisation Of Ucnpsmentioning

confidence: 99%

“…To obtain an in vitro mixed suspension with a given concentration of cells and NPs, we used a suspension in a physiological solution of synthesized NaYF4:Yb,Er NPs with an average size of 80 nm (Figure 1). Four types of NPs were used: Type 1.-Synthesized NaYF4 particles "as is", coated with citrate anions as the synthesis was performed out using sodium citrate; Type 2.-NaYF4 particles annealed at a temperature of 500°С to remove citrate anions from the surface [24]; Type Type 1.-Synthesized NaYF 4 particles "as is", coated with citrate anions as the synthesis was performed out using sodium citrate; Type 2.-NaYF 4 particles annealed at a temperature of 500 • C to remove citrate anions from the surface [24]; Type 3.-NaYF 4 particles coated with SiO 2 [34]; Type 4.-NaYF 4 particles coated with HSA molecules and Methylene Blue.…”

Section: Rbc Studiesmentioning

confidence: 99%

“…The hydrothermal method seems to be the most suitable because of the absence of toxic synthesis products and the possibility of preparing intensely luminescent particles of given sizes [23]. The issue of hydrothermal synthesis is discussed in more detail in the authors'paper [24].…”

Section: Introductionmentioning

confidence: 99%

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NaYF4: Yb,Er Upconversion Nanoparticles for Imaging: Effect on Red Blood Cells

Doronkina,

Kochubey,

Maksutova

et al. 2023

Photonics

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(1) Background: Upconversion nanoparticles (UCNPs) are a promising tool for biological tissue structure visualization and photodynamic therapy (PDT). The luminescence of such NPs is excited in the spectrum’s near-infrared (NIR) region, while the NPs luminesce in the visible region. Conjugating such NPs with photodynamic dyes that absorb their luminescence makes it possible to increase the depth at which PDT is performed. (2) Methods: We conducted a comprehensive study on the possibility of using NaYF4:Er:Yb UCNPs in vivo for imaging and PDT. The NPs were synthesized by a hydrothermal method. The synthesis of NPs with a size of 80 nm and hexagonal structure was demonstrated. (3) Results: The accumulation of NPs in organs after their intravenous injection into rats was studied. The effect of NPs on the shape, size, and degree of aggregation of red blood cells (RBC) was also investigated. (4) Conclusions: The possibility of luminescent visualization of NPs in histological sections and their subcutaneous distribution is demonstrated. All investigated particles showed moderate toxicity, causing mostly reversible changes.

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Section: Synthesis and Size Characterisation Of Ucnpsmentioning

confidence: 99%

Section: Rbc Studiesmentioning

confidence: 99%

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NaYF4: Yb,Er Upconversion Nanoparticles for Imaging: Effect on Red Blood Cells

Doronkina,

Kochubey,

Maksutova

et al. 2023

Photonics

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“…However, the majority of these techniques require a high reaction temperature, reduced atmosphere, complex operation process, and longer duration and may lead to the aggregation of the nanoparticles. Moreover, the synthesis conditions including solvent, temperature, reaction time, and concentration play an important role in determining the phase and size of the prepared particles [30][31][32]. Based on the reported studies hitherto, the phase and size of the upconversion particle were found to play an important role in determining the emission properties of the prepared particles [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis and upconversion luminescence of NaYF4:Yb, Gd, Er and NaYF4:Yb, Gd, Tm nanorods

Nannuri¹,

Singh²,

Misra³

et al. 2022

Methods Appl. Fluoresc.

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Anisotropic rare-earth ion (RE3+) doped fluoride upconversion particles are emerging as a potential candidate in diverse areas, ranging from biomedical imaging to photonics. Here, we develop a facile strategy to synthesize NaYF4:Yb, Er, Gd and NaYF4:Yb, Tm, Gd upconversion nanorods via microwave synthesis route by controlling the synthesis time and compared the optical properties of similar nanorods prepared via solvothermal technique. With the increase in synthesis time, the phase of the particle was found to change from mixed-phase to purely hexagonal and the morphology of the particles change the mixed phase of spherical and rod-shaped particles to completely nanorods for a synthesis time of 60 minutes. Further, the intrinsically hydrophobic particles changed to hydrophilic by removal of oleic capping via acid treatment and the amine-functionalized silica coating. The upconversion luminescence, as well as laser power-dependent emission properties of the surface-modified particles, elucidate that the surface modification route influence the upconversion luminescence as well as solvent-dependent emission properties. Moreover, the laser power-dependent studies elucidate that the upconversion process in a multi-photon process.

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Tailoring structure, morphology and up-conversion properties of CaF2:Yb3+,Er3+ nanoparticles by the route of synthesis

Przybylska

Grzyb

2020

J Mater Sci

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Control of morphology and spectroscopic properties during the synthesis of up-converting nanoparticles (NPs) is a great challenge. One of the most popular ways of NPs synthesis is the hydrothermal method, which is relatively simple, effective, environmentally friendly and permits easy control of synthesis parameters. For these reasons, the hydrothermal method was applied for the synthesis of CaF2:Yb3+,Er3+ NPs and optimized. The effects of synthesis conditions on the properties of the product were carefully analysed. The tests were performed to check the impact of two surfactants: sodium citrate (NaCit) and ammonium citrate (NH4Cit), different excess of ammonium fluoride used as a precipitation agent and different volumes of solution with reactants. The type of co-reagent was found to influence the size of the obtained NPs and charge compensation, required after Yb3+ and Er3+ doping into Ca2+ sites. Depending on the synthesis conditions, the formation of Yb3+ clusters and alterations in the Yb3+ site symmetry were detected. The excitation and emission spectra revealed the importance of the presence of the Na+ ions on the energy transfer mechanism and the resulting emission intensity. The presented results show that applying stirring during the synthesis or changing the type of anti-agglomeration agent has a great influence on the luminescence intensity and colour as well as maximum of excitation when Yb3+ ions are used. Analysis of the excitation spectra and Yb3+ emission decays showed the complex structure of CaF2:Yb3+,Er3+ NPs, with Yb3+ ions in two different environments within the volume of NPs with different site symmetries. The samples prepared in the presence of Na+ ions were characterized by long Yb3+ emission rise times, revealing energy migration between Yb3+ at different symmetries and, at the same time, improved the overall luminescence intensity of NPs.

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Effect of hydrothermal synthesis conditions on up-conversion luminescence intensity of β-NaYF₄ : Er³⁺, Yb³⁺ submicron particles

Cited by 7 publications

References 27 publications

NaYF4: Yb,Er Upconversion Nanoparticles for Imaging: Effect on Red Blood Cells

NaYF4: Yb,Er Upconversion Nanoparticles for Imaging: Effect on Red Blood Cells

Microwave-assisted synthesis and upconversion luminescence of NaYF4:Yb, Gd, Er and NaYF4:Yb, Gd, Tm nanorods

Tailoring structure, morphology and up-conversion properties of CaF2:Yb3+,Er3+ nanoparticles by the route of synthesis

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