Structural and optical properties of Ta2O5:Eu3+: Mg2+ or Ca2+ phosphor prepared by molten salt method

Verma, Naveen; Marı́, B.; Singh, K.C.; Jindal, Jitender; Mollar, M.; Rana, Ravi; Pereira, Aledir Silveira; Manjón, F. J.

doi:10.1063/1.4945202

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…The values are ∼2.9 for SG and ∼4.1 for ST NPs. Thus, in both cases, the 5 D 0 → 7 F 2 transition is dominant over 5 D 0 → 7 F 1 , suggesting a higher occupancy of Eu +3 in a low-symmetry site (Eu is not at the site with the center of symmetry). ,, …”

Section: Resultsmentioning

confidence: 89%

“…Thus, in both cases, the 5 D 0 → 7 F 2 transition is dominant over 5 D 0 → 7 F 1 , suggesting a higher occupancy of Eu +3 in a low-symmetry site (Eu is not at the site with the center of symmetry). 27,28,74 It is worth noting the presence of 5 D 0 → 7 F 0 transition (578−579 nm) in the photoluminescence spectra of both SGand ST-derived NPs. This imposes restrictions on the local coordination of Eu 3+ .…”

Section: Photoluminescence Analysismentioning

confidence: 99%

“…On a Ta 2 O 5 base, luminescent thin films, − bulk gels, and mixed oxides were prepared. Meanwhile, the preparation of REE-doped particles of Ta 2 O 5 is presented in a small number of publications. − The obtained materials are promising for photocatalytic , and electrocatalytic applications, rib waveguide lasers, and X-ray-excited optical luminescent agents . The applicability of luminescent–transparent tantalum oxide nanoparticles (NPs) to decorate upconversion nanophosphors NaYF 4 :Yb 3+ /Er 3+ /Tm 3+ @NaGdF 4 for in vivo multimodal imaging was shown by Xiao et al…”

Section: Introductionmentioning

confidence: 99%

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Stokes and Anti-Stokes Luminescent Rare-Earth-Doped Tantalum Oxide Nanoparticles

et al. 2023

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Doping of nano- and microparticles of oxides with rare earth elements (REEs) is used to fine-tune their structural, optical, and electrochemical properties. On the way to establish the structure–property relationship, we dope tantalum oxide (Ta2O5) particles with REEs to study their effect on the oxide structure and luminescence. Ta2O5 is highly perspective in medicine, catalysis, and optics, but its crystal structure is insufficiently studied. Two synthesis approaches (sol–gel and solvothermal) were used to obtain powders with different textures. Experimental and theoretical studies of amorphous and crystallized tantalum oxide NPs by means of X-ray powder diffraction, Rietveld analysis, EXAFS/XANES spectroscopy, and density functional theory calculations were performed. All samples (doped and undoped) crystallized in orthorhombic phase with no admixtures. It was demonstrated that Ta2O5 is a promising wide-spectrum luminescent material: by combining REEs, both Stokes and anti-Stokes luminescence in the visible region were obtained. By means of optical absorption spectroscopy, it was shown that the prepared samples could be classified as wide band gap semiconductors.

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Section: Resultsmentioning

confidence: 89%

Section: Photoluminescence Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stokes and Anti-Stokes Luminescent Rare-Earth-Doped Tantalum Oxide Nanoparticles

et al. 2023

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Synthesis and photoluminescence properties of Y2O2SO4:Eu3+ nanosheets

Wang

Wen²,

Zhang

et al. 2023

Inorganic Chemistry Communications

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Investigations of LiNb1−xTaxO3 Nanopowders Obtained with Mechanochemical Method

Vasylechko

Sydorchuk²,

Lakhnik

et al. 2021

Crystals

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Nanocrystalline compounds LiNb1−xTaxO3 of various compositions (x = 0, 0.25, 0.5, 0.75, 1) were synthesized by high-energy ball milling of the initial materials (Li2CO3, Nb2O5, Ta2O5) and subsequent high-temperature annealing of the resulting powders. Data on the phase composition of the nanopowders were obtained by X-ray diffraction methods, and the dependence of the structural parameters of LiNb1−xTaxO3 compounds on the value of x was established. As a result of the experiments, the optimal parameters of the milling and annealing runs were determined, which made it possible to obtain single-phase compounds. The Raman scattering spectra of LiNb1−xTaxO3 compounds (x = 0, 0.25, 0.5, 0.75, 1) have been investigated. Preliminary experiments have been carried out to study the temperature dependences of their electrical conductivity.

show abstract

Structural and optical properties of Ta2O5:Eu3+: Mg2+ or Ca2+ phosphor prepared by molten salt method

Cited by 3 publications

References 21 publications

Stokes and Anti-Stokes Luminescent Rare-Earth-Doped Tantalum Oxide Nanoparticles

Stokes and Anti-Stokes Luminescent Rare-Earth-Doped Tantalum Oxide Nanoparticles

Synthesis and photoluminescence properties of Y2O2SO4:Eu3+ nanosheets

Investigations of LiNb1−xTaxO3 Nanopowders Obtained with Mechanochemical Method

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