A new continuous two-step molecular precursor route to rare-earth oxysulfides Ln2O2S

Crom, Nicolas De; Devillers, Michel

doi:10.1016/j.jssc.2012.03.017

Cited by 9 publications

(5 citation statements)

References 55 publications

(93 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rare earth oxysulphates (general formula Ln 2 O 2 SO 4 , Ln represents rare earth) have attracted considerable attention from both the theoretical and the technological points of view. [1][2][3] They have been considered candidates for oxygen storage/release, 4,5 used for auxiliary sensing electrodes 6 and used as a precursor for the synthesis of Ln 2 O 2 S. 7 In addition, Ln 2 O 2 SO 4 has turned out to have unusual magnetic properties at low temperature. 8 Up to now, rare earth oxysulphates can be prepared by conventional solid state reaction, 9 coprecipitation method, 10 template process 11 and ligand way, 3 while electrospinning means has not been described yet.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Xing

Song

Xiong

et al. 2013

Advances in Applied Ceramics

View full text Add to dashboard Cite

Tb 3z doped Y 2 O 2 SO 4 (Y 2 O 2 SO 4 :Tb 3z ) microflakes were prepared by a combination method of electrospinning and calcination. The two-dimensional microflakes had smooth surface and high radial/axial ratio. Crystal structures of the Y 2 O 2 SO 4 :Tb 3z microflakes resulted in layer by layer growth in axial direction. A possible formation mechanism was proposed on the basis of experimental results, which indicated that poly(vinyl pyrrolidone) played the role of the nanostructure directing template and revealed the growth priority in radial direction. The microflakes showed a favourable fluorescent property symbolised by the characteristic green emission (541 nm) resulting from the 5 D 4 R 7 F 5 transition of Tb 3z ions under 229 nm ultraviolet excitation. The maximum intensity of Tb 3z emission of the Y 2 O 2 SO 4 :Tb 3z microflakes was 2?3 times stronger than that of the Y 2 O 2 SO 4 :Tb 3z bulk powders with the same doping concentration.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Xing

Song

Xiong

et al. 2013

Advances in Applied Ceramics

View full text Add to dashboard Cite

show abstract

“…X-ray-stimulated luminescent phosphors are used in various areas including medicine, flaw detection, bio-imaging [1][2][3][4]. Lanthanide oxysulfides are widely used as X-ray stimulated phosphors [5,6]. Presently, terbium-activated gadolinium oxysulfide (Gd2O2S:Tb) is one of the most efficient phosphors of this kind [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Acid-Base and Luminescent Properties of Gd<sub>2</sub>O<sub>2</sub>S: Tb Luminescent Phosphors Synthesized in a Reducing Atmosphere

Rodionova

Kuular

Minakova

et al. 2020

KEM

View full text Add to dashboard Cite

Gd2O2S:Tb phosphors with different terbium content are prepared in a reducing atmosphere at various synthesis conditions. The effect of an activator and Na4P2O7 flux concentrations upon photo-and X-ray induced luminescence of the synthesized samples as well as on their acid-base properties and morphology is studied. The addition of Na4P2O7 flux into the charge mixture leads to a significant increase of the phosphor particle size. A positive correlation is found between the particle size and pH value of the phosphor aqueous slurry. The photoluminescence intensity is found to mostly depend on the activator concentration, while X-ray luminescence intensity primarily depends on the particle size and crystal structure perfectness of the phosphor matrix. Charge mixture compositions and synthesis conditions providing Gd2O2S:Tb phosphors with the highest photo-and X-ray luminescence intensity are determined. A Gd2O2S:Tb phosphor with X-ray luminescence intensity exceeding the values for the commercial phosphor KEP-45 of a similar composition is developed. The obtained phosphors can be used for the manufacture of intensifying screens applied in industrial X-ray flaw detection.

show abstract

“…So far, various synthetic approaches including the sulfide-fusion method, sulfidation, and reduction of the rare-earth sulfates have been employed for the synthesis of rare-earth oxysulfides. − However, the sulfide-fusion method usually uses strong acids to remove the residual impurities, and the sulfidation and sulfide-fusion methods need H 2 S and CS 2 gas for reduction, which markedly restricts the application of these methods. Moreover, highly crystalline single-phase rare-earth oxysulfides are hard to obtain from these methods . To resolve these questions, the development of a low-energy and environmentally friendly synthesis method for the synthesis of rare-earth oxysulfide is highly desired.…”

Section: Introductionmentioning

confidence: 99%

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

Liu

Jing

Wang

et al. 2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

In this paper, a facile one-pot molten salt electrolysis method has been proposed for the synthesis of hexagonal sheet-like Ln 2 O 2 S:Eu 3+ /Tb 3+ (Ln = Sm, La, Gd and Y) phosphors. The phase, composition, morphology, and optical properties of the phosphors were characterized by X-ray powder diffraction (XRD), high-resolution transmission electron microscope (HRTEM), and photoluminescence. The results showed that doping Eu 3+ or Tb 3+ causes no great changes to the crystal structure. Under the excitation of 394 nm light, sheet-like Ln 2 O 2 S:Eu 3+ (Ln = Sm, La, Gd, and Y) exhibited predominantly red emission at around 627 nm, which corresponds to the absorption of host crystals and the energy level transitions of 5 D 0 to 7 F 2 configuration of Eu 3+ ions. The sheet-like Ln 2 O 2 S:Tb 3+ exhibited characteristic excitation of Tb 3+ under 364 nm. The emission spectra of Ln 2 O 2 S:Tb 3+ (Ln = Sm, La, Gd, and Y) were measured, and those emission lines between 450 and 650 nm corresponded to the transitions of 5 D 4 to 7 F J (J = 0−6) ground state energy levels which belonged to the characteristic emission of Tb 3+ . The fabrication mechanism of the sheet-like Ln 2 O 2 S:Eu 3+ /Tb 3+ (Ln = Sm, La, Gd, and Y) was also investigated. This approach provides new avenues for the preparation of phosphors for applications in light-storing fields.

show abstract

A new continuous two-step molecular precursor route to rare-earth oxysulfides Ln2O2S

Cited by 9 publications

References 55 publications

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Acid-Base and Luminescent Properties of Gd<sub>2</sub>O<sub>2</sub>S: Tb Luminescent Phosphors Synthesized in a Reducing Atmosphere

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

Contact Info

Product

Resources

About

A new continuous two-step molecular precursor route to rare-earth oxysulfides Ln2O2S

Cited by 9 publications

References 55 publications

Preparation and luminescent properties of Tb3+doped Y2O2SO4microflakes

Preparation and luminescent properties of Tb3+doped Y2O2SO4microflakes

Acid-Base and Luminescent Properties of Gd<sub>2</sub>O<sub>2</sub>S: Tb Luminescent Phosphors Synthesized in a Reducing Atmosphere

Rapid Production of Ln2O2S:Eu3+/Tb3+ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

Contact Info

Product

Resources

About

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis