Effect of variable trivalent europium concentration on photo- and thermoluminescence of zirconium dioxide nanophosphors

Tiwari, Neha; Kuraria, R.K.; Kuraria, S.R.

doi:10.1016/j.mssp.2014.11.041

Cited by 18 publications

(3 citation statements)

References 42 publications

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“…With an increase in the content of europium ions in the ZrO 2 crystal structure, the phase composition of nanoparticles, the possible concentration quenching, and the P.L. efficiency depend strongly on the synthesis method and the nature of the precursors [30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

“…The emission intensity of Eu 3+ reached a maximum when 4 mol.% stabilizing ions were introduced into the ZrO 2 structure. N. Tiwari and his colleagues synthesized nanophosphors with an m-ZrO 2 structure independently of the Eu 3+ embedded amount (0.5-2.5 mol.%) using the solution combustion technique [36], wherein a P.L. intensity maximum is observed for the sample with 2 mol.% of the lanthanide.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Stabilizing Ion Content on the Structure, Photoluminescence and Biological Properties of Zr1–xEuxO2–0.5x Nanoparticles

et al. 2020

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Quasi-spherical nanoparticles of ZrO2 containing EuO1.5 from 2 to 15 mol.% were synthesized from the chlorides of the corresponding metals under hydrothermal conditions. The structural changes of Zr1–xEuxO2–0.5x (x = 0.02 ÷ 0.15) nanoparticles depending on the content of europium (III) ions were studied using the complementary methods (X-ray diffraction, electron microdiffraction, Raman and photoluminescence spectroscopy). It was shown that increasing the Eu3+ concentration in the Zr1–xEuxO2–0.5x nanoparticles leads to a transition from the equilibrium monoclinic zirconia phase to metastable tetragonal and cubic polymorphic modifications. In this case, the size of the nanoparticles decreases from 11.5 nm to 9 nm; the specific surface area grows from 80.2 to 111.3 m2/g, and the electrokinetic potential increases monotonously from −8.7 to 16.3 mV. The evolution of the phase composition of Zr1–xEuxO2-0.5x nanoparticles from monoclinic to tetragonal/cubic allomorphs with an increase in the molar fraction of stabilizer ions was correlated with changes in the sublevel structure of 5D0 → 7F2 and 5D0 → 7F4 optical transitions for Eu3+ in the luminescence spectra. Besides, for the nanoparticles obtained by hydrothermal synthesis from chlorides, the quantum efficiency does not exceed 3%. According to the M.T.T. assay, as a result of three-day human fibroblast cultivation in the aqueous dispersion of Zr1–xEuxO2–0.5x (x = 0.02 ÷ 0.15) nanoparticles, the proliferation activity of the cells is maintained, indicating that they do not have cytotoxic properties. Such nanoparticles can be used in organic–inorganic composites for medical applications in order to strengthen the polymer scaffolds and visualize changes in their structure within time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Stabilizing Ion Content on the Structure, Photoluminescence and Biological Properties of Zr1–xEuxO2–0.5x Nanoparticles

et al. 2020

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“…The weak intense peak in the vicinity of 593 nm is ascribed to the magnetic dipole transition of 5 D 0 and 7 F 1 levels. The weak emission at 613 nm corresponds to the hypersensitive transition between the 5 D 0 and 7 F 2 levels due to forced electric dipole transition mechanism [27,28].…”

Section: Photoluminescence Studymentioning

confidence: 99%

Optical studies of Eu3+ doped CaZrO3 phosphor for display device applications

Tiwari

Kuraria

2015

Optik

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Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

Tiwari¹,

Dubey

Kuraria³

2016

J Fluoresc

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Behaviour displayed by mechanoluminescence (ML) in CaZrO3:Eu(3+) doped phosphors with variable concentration of europium ions are described. When the ML is excited impulsively by the impact of a load on the phosphors the ML intensity increases with time, attains a maximum value and then it decreases. In the ML intensity versus time curve, the peak increases and shifts towards shorter time values with increasing impact velocities. Sample was synthesized by combustion synthesis method with variable concentration of Eu(3+) ions (0.1, 0.2, 0.5, 1, 1.5 mol%) and characterized by X-ray diffraction technique. The total ML intensity IT is defined as the area below the ML intensity versus time curve. Initially IT increases with impact velocity V0 of the load and then it attains a saturation value for higher values of impact velocities which follow the relation IT = IT (0) exp.(-Vc/V0) where IT (0) and Vc are constants. Total ML intensity increases linearly with the mass of the phosphors for higher impact velocities. The ML intensity Im, corresponding to the peak of ML intensity versus time curve increases linearly with the impact velocities. The time tm, is found to be linearly related to 1000/V0. The mechanoluminescence induced by impulsive excitation in europium doped CaZrO3 phosphors plays a significance role in the understanding of biological sensors and display device application.

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Effect of variable trivalent europium concentration on photo- and thermoluminescence of zirconium dioxide nanophosphors

Cited by 18 publications

References 42 publications

Influence of Stabilizing Ion Content on the Structure, Photoluminescence and Biological Properties of Zr1–xEuxO2–0.5x Nanoparticles

Influence of Stabilizing Ion Content on the Structure, Photoluminescence and Biological Properties of Zr1–xEuxO2–0.5x Nanoparticles

Optical studies of Eu3+ doped CaZrO3 phosphor for display device applications

Mechanoluminescence Study of Europium Doped CaZrO3 Phosphor

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