Synthesis and characterization of Gd2O3:Eu3+ phosphor nanoparticles by a sol-lyophilization technique

Louis, Cédric; Bazzi, Rana; Flores, Marco A.; Zheng, Weili; Lebbou, K.; Tillement, Olivier; Mercier, Bruno; Dujardin, Christophe; Perriat, Pascal

doi:10.1016/s0022-4596(03)00107-5

Cited by 90 publications

(52 citation statements)

References 12 publications

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“…In Gd(OH) 3 :Eu and GdOOH:Eu weak and broad emission peaks at $ 465, 575, 614 and 621 nm were observed. The emission lines with peaks at $ 614 and 621 nm observed for the 5 D 0 -7 F 2 transition is consistent with the hexagonal Gd(OH) 3 :Eu [25]. Fig.…”

Section: Introductionsupporting

confidence: 80%

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

Dhananjaya

Nagabhushana

et al. 2011

Physica B: Condensed Matter

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a b s t r a c tDifferent phases of Eu 3 + activated gadolinium oxide (Gd (OH) 3 , GdOOH and Gd 2 O 3 ) nanorods have been prepared by the hydrothermal method with and without cityl trimethyl ammonium bromide (CTAB) surfactant. Cubic Gd 2 O 3 :Eu (8 mol%) red phosphor has been prepared by the dehydration of corresponding hydroxide Gd(OH) 3 :Eu after calcinations at 350 and 600 1C for 3 h, respectively. When Eu 3 + ions were introduced into Gd(OH) 3 , lattice sites which replace the original Gd 3 + ions, a strong red emission centered at 613 nm has been observed upon UV illumination, due to the intrinsic Eu 3 + transition between 5 D 0 and 7 F configurations. Thermoluminescence glow curves of Gd (OH) 3 : Eu and Gd 2 O 3 :Eu phosphors have been recorded by irradiating with gamma source ( 60 CO) in the dose range 10-60 Gy at a heating rate of 6.7 1C sec À 1 . Well resolved glow peaks in the range 42-45, 67-76, 95-103 and 102-125 1C were observed.When g-irradiation dose increased to 40 Gy, the glow peaks were reduced and with increase in g-dose (50 and 60 Gy) results the shift in first two glow peak temperatures at about 20 1C and a new shouldered peak at 86 1C was observed. It is observed that there is a shift in glow peak temperatures and variation in intensity, which is mainly attributed to different phases of gadolinium oxide. The trapping parameters namely activation energy (E), order of kinetics (b) and frequency factor were calculated using peak shape and the results are discussed.

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Section: Introductionsupporting

confidence: 80%

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

Dhananjaya

Nagabhushana

et al. 2011

Physica B: Condensed Matter

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“…The main factor affecting the intensity of the charge transfer band is the efficiency of the energy process from the CTB to the Eu 3+ emitting level. It shows that with increasing heat treatment, the interaction between O 2− and Eu 3+ ions in the silicate host becomes stronger which facilitates the electron transfer from O 2− to Eu 3+ [17,18]. In the present study, the weak excitation peak observed at 337 nm suggests that the interaction between O 2− and Eu 3+ is stronger; hence the efficiency of the energy transfer process from the charge transfer band (256 nm) to Eu 3+ emitting levels increases.…”

Section: Resultssupporting

confidence: 45%

Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

Prashantha

Lakshminarasappa

Nagabhushana

2011

Journal of Alloys and Compounds

119

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Phosphor Photoluminescence Thermoluminescence Optical absorption a b s t r a c t Nanoparticles of Eu 3+ doped Mg 2 SiO 4 are prepared using low temperature solution combustion technique with metal nitrate as precursor and urea as fuel. The synthesized samples are calcined at 800• C for 3 h. The Powder X-ray diffraction (PXRD) patterns of the sample reveled orthorhombic structure with ␣-phase. The crystallite size using Scherer's formula is found to be in the range 50-60 nm. • C and 345• C besides a shoulder with peak at ∼240• C are observed. The trapping parameters-activation energy (E), order of kinetics (b) and frequency factor (s) are calculated using glow curve shape method and the results obtained are discussed.

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“…Peak intensity decrease was followed also by bandwidth broadening and the size effect was most pronounced for low energy frequencies. Peak intensity decrease and broadening upon reduced particle size was noticed also by Zhang (Zhang et al 2004) Heating Gd 2 O 3 nanoparticle samples is tightly coupled to crystal growth (Louis et al 2003). Table 2.…”

Section: Molecular Compositionmentioning

confidence: 69%

A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study

et al. 2012

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In all kinds of gadolinium based contrast agents, the presence of free gadolinium ions have to be avoided due to the cytotoxicity. The conventional way of producing a gadolinium based contrast agent is to form a chelate, i.e. stabilizing the metal ion using a chelating agent (for example DTPA or DOTA) but recently nanoparticles is an initial step towards biocompatible and directed nanoparticles.The main focus is on a material that in the nearby future will be the core of an The experimental results are supported by theoretical modeling studies.Theoretical IR spectra of three different Gd acetate complexes are presented as well as calculated NEXAFS spectra of one of the Gd acetate complexes and an isolated acetate group. These calculations were performed to elucidate the molecular capping of the synthesized particles. 5 EXPERIMENTAL DETAILS ChemicalsAll chemicals were used as received. Gadolinium(III) acetate hydrate (SigmaAldrich, 99.9 %), tetramethylammonium hydroxide (Sigma-Aldrich, >97 % ), ethyl acetate (Fisher Scientific, 99.99 %), dimethyl sulfoxide (Merck, 99.9 %), ammonium acetate (Merck, >96%), ethanol (Kemetyl, 99.5 %). For preparation of water based solutions, Milli-Q water (ρ > 18.2 MΩ) was used. A commercial gadolinium oxide nanopowder (Aldrich, < 100 nm, 99.8 %) was used as a reference. Preparation of Gd 2 O 3 nanoparticlesThe preparation of Gd 2 O 3 nanoparticles was based on a method previously used for producing nanocrystalline ZnO (Schwartz et al. 2003). As Zn 2+ is divalent and Ethyl acetate was added and the mixture was centrifuge washed (3500 rpm) at least three times with ethyl acetate before it was diluted in deionized water. A total amount of 0.28 g ammonium acetate was added to one whole batch to increase the water solubility. Powder samples were air dried. The yield of the sample is dependent on the washing procedure. The gadolinium content after three times of centrifuge washing with ethyl acetate is roughly 60-65 % of the initial amount added in the synthesis.6 Instrumentation X-ray diffraction XRD measurements were carried out with a Philips XRD powder diffractometer using Cu Kα radiation (λ = 1.5418 Å, 40kV, 40 mA). The 2θ step-size was 0.025° and the time per step 4 s. Air dried powder samples were used in the preparation.High-resolution transmission electron microscopy TEM measurements were performed on a FEI Tecnai G 2 electron microscope operated at 200 kV. Sample preparation was done by letting 1-2 drops of Gd 2 O 3 in water dry on an amorphous carbon-covered copper grid.Dynamic light scattering DLS measurements were carried out on an ALV/DLS/SLS-5022F system from ALV-GmbH, Langen Germany, using a HeNe laser at 632.8 nm with 22 mW output power. Prior to the measurements, the samples were temperature stabilized in a thermostat bath at 22.1 °C for at least 10 minutes. The scattering angle was 90°. 15 Gd 2 O 3 samples dispersed in MilliQ water were studied in DLS, and the long term stability of the suspensions were studied by repeated measurements during a period of 6 weeks.ζ Pot...

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Synthesis and characterization of Gd2O3:Eu3+ phosphor nanoparticles by a sol-lyophilization technique

Cited by 90 publications

References 12 publications

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

Thermo and photoluminescence properties of Eu3+ activated hexagonal, monoclinic and cubic gadolinium oxide nanorods

Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study

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