Luminescence properties of the new complex La,BiVO4:Mo,Eu compounds as materials for down-shifting of VUV–UV radiation

Nedilko, S.; Chukova, O.; Chornii, V.; Degoda, V.Ya.; Bychkov, Konstantin L.; Тerebilenko, К.; Slobodyanik, M.S.

doi:10.1016/j.radmeas.2016.02.027

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…Actually, some of the abovementioned applications require vanadate materials with improved efficiency of luminescence excitation under light from near UV and violet spectral ranges [ 4 , 13 – 15 ]. The search for new vanadate compounds for these needs is carried out using variations of two and more cations in their composition including partial iso- and heterovalent substitutions [ 16 – 19 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

et al. 2017

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The La1 − xCaxVO4 and La1 − x − yEuyCaxVO4 (0 ≤ x, y ≤ 0.2) micro/nanosized powders were prepared by aqueous nitrate–citrate sol–gel synthesis. Phase composition of the sample depends on the x and y values. The La0.9Ca0.1VO4 is crystallized in monoclinic structure up to the x = 0.1. The La0.9Eu0.05Ca0.05VO4 sample was also attributed to the monoclinic structure. Increasing concentration of europium and calcium ions in La1 − x − yEuyCaxVO4 solid solutions leads to the change of the crystal structure, and subsequently, stabilization of the tetragonal phase takes place.The obtained samples were characterized by XRD analysis, SEM microscopy, and IR spectroscopy. Luminescence properties of the synthesized powders were studied. Emission of the La1 − xCaxVO4 samples is weak and consists of wide bands in the 450–800 nm spectral range. The observed bands at 570 and 630 were ascribed to electron transitions in the distorted VO4 3− vanadate groups. Emission of the La1 − x − yEuyCaxVO4 samples consists of narrow spectral lines in the 550–730 nm spectral range. The lines are caused by the 5D0 → 7FJ electron transitions in the Eu3+ ions. The Ca2+ ions incorporation increases the intensity of the Eu3+ ions luminescence. Structure of the spectra depends on Ca2+ concentration and excitation wave length. The carried out analysis has revealed that Eu3+ ions form at least two different types of emission centers in the La1 − x − yEuyCaxVO4 samples. The assumption is made that type I centers are formed by the Eu3+ ions in their regular positions in the crystal lattice, while the type II centers have complex structure and consist of Eu3+ ions, Ca2+ cations, and oxygen vacancies.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

et al. 2017

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“…Maxima of the broad band is shifted in a long wave length range from 320 nm for the co-precipitated samples to 330 nm for the sol-gel samples, whereas maxima of the narrow structures bands are shifted in a short wavelength range for the sol-gel samples (Figs. 10,11). At the same time, spectra registered for the sol-gel samples in the lines with different behavior (see Fig.…”

Section: Excitationmentioning

confidence: 79%

“…The wide range of their applications have attracted significant research efforts to development of new vanadate compositions with improved characteristics depending on requirements of various practical tasks [6][7][8][9]. In particular, increase of excitation efficiency under light from near UV and violet spectral ranges is needed for solar energy conversion applications, whereas biological applications require light transformer materials safe to human body with high efficiency of energy transformation in order to decrease x-rays irradiation of living tissues [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Structure and spectroscopy characterization of La1-xSmxVO4 luminescent nanoparticles synthesized co-precipitation and sol-gel methods

et al. 2019

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The Sm-activated orthvanadate nanoparticles with La 1-x Sm x VO 4 (x ≤ 0.3) composition were synthesized by co-precipitation and sol-gel methods. XRD study has shown that synthesized samples are characterized by monoclinic or tetragonal structure as well as their mixture dependently on Sm concentration and methods of synthesis. Influence of method of synthesis on morphology of nanoparticles, their absorption, diffuse reflectance and emission spectra was observed and studied. Luminescence properties and diffuse reflectance spectra of the sol-gel nanoparticles are also depend on Sm concentrations. At least two types of Sm 3+ centers were found by emission spectra. These centers have different excitation efficiency by light from the 350-450 nm spectral range. Structures of the centers are discussed taking into account crystal structure, possible defects, morphology of the synthesized nanoparticles and their phase compositions.

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“…However, polymer matrices are quickly aging under actions of light and heating (Yousif and Haddad, 2013). Attempts to solve this problem have drawn attention to creation of light transformers on the base of inorganic oxide materials Deun, 2018, Huang et al, 2013;Nedilko et al, 2015Nedilko et al, , 2016Shinde et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Pulsed laser deposition of the LaVO4:Eu, Ca nanoparticles on glass and silicon substrates

et al. 2020

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Thin films from the L VO 4 :Eu,Ca nanoparticles were successfully grown by pulsed laser deposition method on glass and silicon substrates for the first time. Morphology and thickness of the films depend on a type of substrate and a number of pulses. The films are of 27-220 nm thickness and formed by very small particles (up to 20 nm) and also can contain single nanoparticles with dimensions 40-60 nm and sometimes agglomerates of nanoparticles. Spectral properties of the samples have been investigated and discussed. The vanadate films deposited on the silicon substrates lead to appearance of antireflection properties in the visible range. Luminescence spectra of the investigated films consist of narrow lines caused by f-f transitions in the Eu 3+ ions. For the samples on glass substrates the wide bands of glass emission are also contributed to the spectra. The optimal experimental conditions those allowed to obtain films promising for applications as luminescent converters are considered.

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Luminescence properties of the new complex La,BiVO4:Mo,Eu compounds as materials for down-shifting of VUV–UV radiation

Cited by 16 publications

References 22 publications

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Structure and spectroscopy characterization of La1-xSmxVO4 luminescent nanoparticles synthesized co-precipitation and sol-gel methods

Pulsed laser deposition of the LaVO4:Eu, Ca nanoparticles on glass and silicon substrates

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