Structural studies and luminescence properties of CeO2:Eu3+ nanophosphors synthesized by oxalate precursor method

Vimal, G.; Mani, Kamal P.; Biju, P.R.; Joseph, Cyriac; Unnikrishnan, N.V.; Ittyachen, M. A.

doi:10.1007/s13204-014-0375-5

Cited by 52 publications

(22 citation statements)

References 37 publications

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“…At low doping concentrations, the Eu 3+ ions mainly enter into the lattice with inversion symmetry. With the increased Eu 3+ doping, they can replace Ce 4+ and create symmetry distortions to cause the electric dipole transitions [6]. In the present case, the 5 D 0 !…”

Section: Resultsmentioning

confidence: 68%

“…The absence of electrons in the 4f shell makes CeO 2 an ideal host material for europium. By doping Eu 3+ ions into CeO 2 host, it can encourage effective energy transfer from the Ce 4+ -O 2host to Eu 3+ ions and greatly enhance the luminescent properties [6]. Moreover, since the ionic radius of Eu 3+ (0.1066 nm) is close to that of Ce 3+ (0.1143 nm) and Ce 4+ (0.097 nm), it favors extensive solubility of Eu 3+ within the ceria lattice [7].…”

Section: Introductionmentioning

confidence: 99%

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Plasma-electrochemical synthesis of europium doped cerium oxide nanoparticles

Lin

et al. 2019

Front. Chem. Sci. Eng.

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In the present study, a plasma-electrochemical method was demonstrated for the synthesis of europium doped ceria nanoparticles. Ce(NO 3 ) 3 $6H 2 O and Eu(NO 3 ) 3 $5H 2 O were used as the starting materials and being dissolved in the distilled water as the electrolyte solution. The plasma-liquid interaction process was in-situ investigated by an optical emission spectroscopy, and the obtained products were characterized by complementary analytical methods. Results showed that crystalline cubic CeO 2 :Eu 3+ nanoparticles were successfully obtained, with a particle size in the range from 30 to 60 nm. The crystal structure didn't change during the calcination at a temperature from 400°C to 1000°C, with the average crystallite size being estimated to be 52 nm at 1000°C. Eu 3+ ions were shown to be effectively and uniformly doped into the CeO 2 lattices. As a result, the obtained nanophosphors emit apparent red color under the UV irradiation, which can be easily observed by naked eye. The photoluminescence spectrum further proves the downshift behavior of the obtained products, where characteristic 5 D 0 ! 7 F 1,2,3 transitions of Eu 3+ ions had been detected. Due to the simple, flexible and environmental friendly process, this plasma-electrochemical method should have great potential for the synthesis of a series of nanophosphors, especially for bio-application purpose.

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Section: Resultsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Plasma-electrochemical synthesis of europium doped cerium oxide nanoparticles

Lin

et al. 2019

Front. Chem. Sci. Eng.

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“…The spectra exhibit a wide and strong excitation band due to the charge transfer from O 2-to Ce 4? in the wavelength region 300-370 nm [18,29]. It is found that the charge transfer band shifts to a lower energy when the annealing temperature increases.…”

Section: Optical Characterizationsmentioning

confidence: 96%

Influences of Annealing Temperature and Doping Concentration on Microstructural and Optical Properties of CeO2:Sm3+ Nanocrystals

Vimal

Mani

Biju

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Nanocrystals of CeO 2 with different doping concentrations of Sm 3? were synthesized by a novel and costeffective method. The crystal structure, morphology and particle size were systematically investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Effects of the annealing temperature and doping concentrations on the microstructural properties of the crystals were studied. X-ray diffraction analysis indicates that the cubic structure of the CeO 2 is not affected by the doping of Sm 3? up to a doping concentration of 20%. Different structural parameters such as lattice constant, surface area, bulk density and porosity of the crystal were determined and discussed. Microscopic images of the CeO 2 :Sm 3? suggest that the thermal decomposition of oxalate precursor is a suitable synthesis pathway to produce uniform-sized microparticles and nanoparticles. The influences of annealing temperature and doping concentration of Sm 3? on the optical properties of the nanocrystals were also discussed. The photoluminescence excitation spectra reveal that the charge transfer band is redshifted with increasing annealing temperatures. Emission attains its maximum intensity for Sm 3? concentration of 1%, and higher concentrations lead to emission quenching.

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“…One of the simple, effective and low-cost CeO2 synthesis routes is oxalic precipitation followed by a calcination step [7][8][9][10]. The process takes advantage of the high insolubility of oxalate salts to recover REEs.…”

Section: Introductionmentioning

confidence: 99%

Morphology-Controlled Precipitation of Cerium Oxalate Crystals: The Effect of Water in Nanostructured Solvents

Liaščukienė

Jéhannin²,

Lautru

et al. 2021

J. Phys. Chem. C

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The ability to control the morphology of precipitated cerium oxalate material results in determinate evidence to its final properties. In this study, we demonstrate that surfactant free nanostructured low water solvents have a huge potential for controlling the morphology of a cerium oxalate powder. In this aim, an in-depth investigation of the reaction between cerium nitrate and oxalic acid is carried out, by varying both the relative concentration of the two reagents (around stoichiometric value), and the composition of the water / propanediol / octanol ternary solvent (especially in the low water-content nanostructured domain). Thanks to the complementary of observation methods: microscopy (confocal microscopy with fluorophores, environmental SEM), and X-ray scattering (SAXS, WAXS), we evidenced the role of the solvent on the growth kinetics and directional aggregation of the precipitates -the two major factors determining the final morphology of the particles. Besides the possible confinement effect in nanodroplets, compact "dense-branching" particles, achieved in low water content solvent, unveil the strong role of the surface forces on the aggregation mechanisms. This is consistent with the prevailing capillary forces at water / oil / solid triple points in ternary solvents. These new results confirm the high potential of nanostructured solvents for controlling the size and shape of hydrated precipitated particles.

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Structural studies and luminescence properties of CeO2:Eu3+ nanophosphors synthesized by oxalate precursor method

Cited by 52 publications

References 37 publications

Plasma-electrochemical synthesis of europium doped cerium oxide nanoparticles

Plasma-electrochemical synthesis of europium doped cerium oxide nanoparticles

Influences of Annealing Temperature and Doping Concentration on Microstructural and Optical Properties of CeO2:Sm3+ Nanocrystals

Morphology-Controlled Precipitation of Cerium Oxalate Crystals: The Effect of Water in Nanostructured Solvents

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