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

(4 citation statements)

References 55 publications

(93 reference statements)

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“…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%

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Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Xing

Song

Xiong

et al. 2013

Advances in Applied Ceramics

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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.

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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

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“…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.

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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.

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“…The rare earth oxysulfied phosphors was commonly synthesized by solid-state reaction method, such as reduction of rare earth sulfate by H 2 or CO, sulfuration of rare earth oxied by H 2 S or CS 2 , and reaction between an rare earth oxide and a sulfide. 4,5) However, these methods are difficult to synthesize the rare earth oxysulfide as a single phase form with high crystallinity and H 2 S and CS 2 gas is an extremely harmful gas for humans.…”

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confidence: 99%