Yttrium(iii) oxomolybdates(vi) as potential host materials for luminescence applications: an investigation of Eu3+-doped Y2[MoO4]3 and Y2[MoO4]2[Mo2O7]

A good LED phosphor must possess strong enough absorption, high quantum yields, colour purity, and quenching temperatures. Our synthesized Y2Mo4O15:Eu3+ phosphors possess all of these properties. Excitation of these materials with near-UV or blue radiation yields bright red emission and the colour coordinates are relatively stable upon temperature increase. Furthermore, samples doped with 50% Eu3+ showed quantum yields up to 85%, what is suitable for commercial application. Temperature dependent emission spectra revealed that heavily Eu3+ doped phosphors possess stable emission up to 400 K and lose half of the efficiency only at 515 K. In addition, ceramic disks of Y2Mo4O15:75%Eu3+ phosphor with thickness of 0.71 and 0.98 mm were prepared and it turned out that they efficiently convert radiation of 375 and 400 nm LEDs to the red light, whereas combination with 455 nm LED yields purple colour.

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“…Synthesis of the Y 2 Mo 4 O 15 :Eu 3+ powders at 850 °C as reported by S. Laufer et al 16. yielded a mixture of various yttrium molybdates.…”

Section: Resultsmentioning

confidence: 93%

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Janulevicius

Marmokas

Misevicius

et al. 2016

Sci Rep

134

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“…YFMo 2 O 7 was obtained from a mixture of yttrium sesquioxide (Y 2 O 3 : 99.9 %; ChemPur, Karlsruhe, Germany), yttrium trifluoride (YF 3 : 99.9 %; ChemPur, Karlsruhe, Germany), and molybdenum trioxide (MoO 3 : p. a.; Merck, Darmstadt, Germany) in a 1 : 1 : 6 molar ratio, which was tempered at 850 °C for six days in evacuated silica ampoules according to equation (1): (1) Y 2 O 3 + YF 3 + 6 MoO 3 → 3 YFMo 2 O 7 . From this reaction colorless, transparent, platelet-shaped crystals of the title compound were obtained, which remained stable in air and water, while a shorter reaction time only yields a microcrystalline crude product.…”

Section: Experimental Synthesismentioning

confidence: 99%

“…View at the crystal structure of YFMo 2 O 7 along the a axis. The structure can be described as being built up by } layers (represented by blue polyhedra) and1 ∞ {[YF 2/2 ] 2+ } strands (within the red polyhedra).…”

mentioning

confidence: 99%

Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo₂O₇

et al. 2014

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Thermal treatment of a mixture of Y2O3, YF3 and MoO3 in a 1 : 1 : 6 molar ratio at 850 °C in evacuated silica ampoules yielded colorless, platelet-shaped single crystals of YFMo2O7. SiO2 was dissolved from the ampoule wall in small amounts, but could be removed from the crude product by treatment with hydrofluoric acid (20%). The title compound crystallizes monoclinically in the space group P2/c with two formula units per unit cell with the dimensions a = 4.2609(2), b = 6.5644(4), c = 11.3523(7) Å, and β = 90.511(2)°. Its crystal structure contains crystallographically unique Y(3+) cations in a pentagonal bipyramidal environment consisting of two F(-) anions in the apical positions and five O(2-) anions in the equatorial positions. These polyhedra are connected to {[YFO](8-)} chains along [100] by sharing common F(-) vertices. The likewise crystallographically unique Mo(6+) cations exhibit a coordination number of five and reside in the centers of distorted square pyramids built up of oxide anions. These entities are fused to chains along [001] by sharing common edges and vertices according to {[MoOOO](-)}. Taking a sixth oxygen ligand further away from the Mo(6+) cations into account, the aforementioned chains assemble to corrugated {[MoOOO](-)} layers perpendicular to [010] with the {[YFO](8-)} chains situated between these sheets. Since Y(3+) represents a non-luminescent rare-earth metal(iii) cation, YFMo2O7 is a suitable host material for doping with luminescence-active lanthanoid(iii) cations, such as Eu(3+).

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“…In this context, yttrium molybdate, Y 2 (MoO 4 ) 3 , is a suitable host for the Eu 3+ ion due to its low relative phonon frequency, high thermal and electrical stability, high UV absorption of the MoO 4 groups, and the similar radii between Y 3+ and Eu 3+ ions. [14,15] The synthesis of Y 2 (MoO 4 ) 3 :Eu 3+ phosphor via solid-state [14] or co-precipitation [16] methods are already reported in the literature; however, to date, no reference has been found on the use of the Pechini's method to obtain such material. In this way, the Pechini method was chosen in this present study for the preparation of the red phosphor Y 2 (MoO 4 ) 3 :Eu 3+ based on the fact that it is a simple, and low-cost methodology, that allows good structural and stoichiometric control in the synthesis of high purity metal oxide particles.…”

Section: Introductionmentioning

confidence: 99%

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

et al. 2018

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Structural, morphological and spectroscopic characterization of the Eu 3+-doped Y 2 (MoO 4) 3 red phosphor incorporated with Au nanoparticles (Au NPs) synthesized via Pechini's method is reported in the present study. In order to evaluate the Au NPs and Eu 3+ ions influence on the molybdate structure, the Y 2 (MoO 4) 3 , Y 2 (MoO 4) 3 :Eu 3+ , Y 2 (MoO 4) 3 /Au and Y 2 (MoO 4) 3 :Eu 3+ /Au samples were produced and fully investigated. All samples obtained at relatively low temperature, i.e., 650°C, show molybdate as the unique phase with high crystallinity assisted by both Eu 3+ ions and Au NPs. Water molecules detected in the molybdate structure probably are distorting MoO 4 , YO 6 and EuO 6 polyhedra similarly to the Au NPs incorporated in the same lattice. These Au NPs are spherical-shaped with a diameter near to 46 nm and they are located on the molybdate particle surface. The Eu 3+-doped phosphors, with or without the presence of Au NPs, exhibit intense red luminescence characteristic of the Eu 3+ ion inserted in low-symmetry sites. However, the Au NPs increase the radiative emission rate and absolute quantum yield of the Eu 3+ 5 D 0 emitter state due to the excitation field enhancement caused by the local surface plasmon resonance absorption effect of gold nanoparticles, which was confirmed by diffuse reflectance measurements. Finally, the Eu 3+ quantum efficiency enhancement to 92% played by the gold nanoparticles and the high red color purity qualify the obtained phosphor for photonic applications.

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Yttrium(iii) oxomolybdates(vi) as potential host materials for luminescence applications: an investigation of Eu3+-doped Y2[MoO4]3 and Y2[MoO4]2[Mo2O7]

Cited by 32 publications

References 25 publications

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo₂O₇

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

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Yttrium(iii) oxomolybdates(vi) as potential host materials for luminescence applications: an investigation of Eu3+-doped Y2[MoO4]3 and Y2[MoO4]2[Mo2O7]

Cited by 32 publications

References 25 publications

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo2O7

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

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Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo₂O₇