Luminescence of Eu<sup>3+</sup> ions in hybrid polymer‐inorganic composites based on poly(methyl methacrylate) and zirconia nanoparticles

ZrO 2 nanoparticles doped with 2 mol.% of EuO 1.5 were obtained from solutions of inorganic salts, zirconium alkoxide and chelating compounds under hydro and solvothermal conditions. The phase compositions of the synthesized nanophosphors were determined using the methods of X-ray diffraction, photoluminescence and Raman spectroscopy. The changes in a particle size, the value of the specific surface area and its charge depending on the conditions of preparation (the type of solvent, isothermal exposure time) and the precursor nature used in the synthesis were considered. It was found that Zr 0.98 Eu 0.02 O 1.99 nanoparticles with a high content of the monoclinic phase, synthesized from zirconium and europium acetylacetonates, have the highest luminescence efficiency. At the same time, the maximum photoluminescence lifetime and the least cytotoxicity were characteristic of crystal phosphors with a more symmetrical crystal lattice of the host matrix, as well as a high surface area/volume ratio.

Section: Characterization Techniquesmentioning

confidence: 99%

The influence of chemical prehistory on the structure, photoluminescent properties, surface and biological characteristics of Zr0.98Eu0.02O1.99 nanophosphors

Bugrov¹,

Smyslov²,

Zavialova³

et al. 2019

“…In some cases, the factor contributing to the release of the transported drug from the nanocapsules may be the changing pH of the medium into which they find themselves. By their composition, the metal-containing biomedical nanoparticles are usually divided into purely metallic, e.g., gold copper, silver, and nanoparticles with a complex composition, for example, based on oxides of iron, copper, zinc, titanium, tungsten, on cerium and zirconium dioxides, including those containing rare earth metals [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86], etc.…”

Section: Nanostructured Systemsmentioning

confidence: 99%

The use of nanocluster polyoxometalates in the bioactive substance delivery systems

Остроушко¹,

Gagarin²,

Данилова³

et al. 2019

Nanoscale systems occupy the most important place among the vehicles intended for targeted drug delivery. Such vehicles are considered in this review. Attention is paid to the nanocluster polyoxometalate-based systems which are promising for transdermal iontophoretic transport. In this relation, and due to the characteristics of the skin as a transport medium, the problems of the transfer processes modeling are considered.

“…Spectrum 2 shows an emission band of anatase-type TiO 2 :Eu 3+ nanoparticles obtained under solvothermal conditions at excitation wavelength of 352 nm. According to the Stark splitting for 5…”

Section: Luminescence Propertiesmentioning

confidence: 99%

“…The phosphors with lanthanide ions as photoluminescence centers are promising materials that have been used in artificial lighting sources [1], cathode ray tubes [2], emission displays [3], solid-state lasers [4], fluorescent probes [5] and biomedical devices [6,7]. The luminescent properties of such emitting materials depend on the efficiency of energy transfer from the absorption center (ligand) to the emission center (lanthanide ion) and on the concentration of quenchers (OH groups) surrounding photoactive ions [8].…”

Section: Introductionmentioning

confidence: 99%

Structure and photoluminescent properties of TiO2:Eu3+ nanoparticles synthesized under hydro and solvothermal conditions from different precursors

Zavialova¹,

Bugrov²,

Smyslov³

et al. 2019

Crystalline phosphors of Eu 3+-doped titania (TiO 2 :Eu 3+) were prepared by hydro and solvothermal synthesis with luminescent ion concentration of 2 mol.%. The structure and shape of the synthesized nanoparticles were characterized using X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy. Changes in the emission, excitation spectra, and the intensity decay of the photoluminescence for TiO 2 :Eu 3+ nanoparticles were analyzed their phase composition. The photoluminescence of synthesized TiO 2 :Eu 3+ crystalline phosphors depends on whether the said nanophosphors are formed from organometallic or inorganic precursors under hydro-and solvothermal conditions. Indeed, photoluminescence excitation at wavelengths ranging from 350-550 nm leads to splitting of electron dipole transitions into Stark components according to the symmetry of the Eu 3+ surroundings. Also, both nanoparticles with the anatase structure and phosphors predominantly containing rutile showed very short photoluminescence lifetimes.