Luminescence of the self-activated vanadate phosphors Na2LnMg2V3O12 (Ln=Y, Gd)

Song, Dongfang; Guo, Chongfeng; Li, Ting

doi:10.1016/j.ceramint.2015.01.094

Cited by 60 publications

(34 citation statements)

References 28 publications

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“…The observed bands can be assigned to electron transitions in the VO 4 3− groups; those are constituents of mentioned compounds. The charge transfer transitions of 3d orbitals electron of the V 5+ ion to the 2p orbital electron of the O 2− ion inside of the VO 4 3− groups are the nature of this luminescence [40, 41]. According to energy scheme of the vanadate tetrahedron, emission bands at 570 and 630 nm are connected respectively with 3 T 2 and 3 T 1 → 1 A 1 electron transitions in the VO 4 3− groups [39–41].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

et al. 2017

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The La1 − xCaxVO4 and La1 − x − yEuyCaxVO4 (0 ≤ x, y ≤ 0.2) micro/nanosized powders were prepared by aqueous nitrate–citrate sol–gel synthesis. Phase composition of the sample depends on the x and y values. The La0.9Ca0.1VO4 is crystallized in monoclinic structure up to the x = 0.1. The La0.9Eu0.05Ca0.05VO4 sample was also attributed to the monoclinic structure. Increasing concentration of europium and calcium ions in La1 − x − yEuyCaxVO4 solid solutions leads to the change of the crystal structure, and subsequently, stabilization of the tetragonal phase takes place.The obtained samples were characterized by XRD analysis, SEM microscopy, and IR spectroscopy. Luminescence properties of the synthesized powders were studied. Emission of the La1 − xCaxVO4 samples is weak and consists of wide bands in the 450–800 nm spectral range. The observed bands at 570 and 630 were ascribed to electron transitions in the distorted VO4 3− vanadate groups. Emission of the La1 − x − yEuyCaxVO4 samples consists of narrow spectral lines in the 550–730 nm spectral range. The lines are caused by the 5D0 → 7FJ electron transitions in the Eu3+ ions. The Ca2+ ions incorporation increases the intensity of the Eu3+ ions luminescence. Structure of the spectra depends on Ca2+ concentration and excitation wave length. The carried out analysis has revealed that Eu3+ ions form at least two different types of emission centers in the La1 − x − yEuyCaxVO4 samples. The assumption is made that type I centers are formed by the Eu3+ ions in their regular positions in the crystal lattice, while the type II centers have complex structure and consist of Eu3+ ions, Ca2+ cations, and oxygen vacancies.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

et al. 2017

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“…The 380–425 and 460–480 nm bands correspond to range of the 5 F 0 → 7 D 3 and 5 F 0 → 7 D 2 excitation transitions in the Eu 3+ ions, respectively . The 320 nm band in vanadate compounds is usually connected with 1 A 1 → 1 T 2 transitions in the VO 4 3‐ anions . The additional wide excitation band near 370–390 nm is related with influence of the Ca 2+ impurities as this band was not observed nor for the EuVO 4 neither for the Ca‐free La 1− x Eu x VO 4 samples (Figure , curve 5,).…”

Section: Luminescent Propertiesmentioning

confidence: 94%

“…The Ca 2+ cation, VO 4 3‐ anion and oxygen vacancy trapped electron [V O + e] + can form electro neutral complexes with strongly distorted symmetry of tetrahedral VO 4 3‐ groups. It is well known that excitation bands of vanadate compounds in the 270–350 nm spectral range are caused by 1 A 1 → 1 T 1 and 1 T 2 transitions in the VO 4 3− anions . Significant deformations of molecular orbitals of the VO 4 3− groups could influence their energy levels and increase probability of excitation transitions with participation of lower triplet states.…”

Section: Luminescent Propertiesmentioning

confidence: 99%

Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light

Chukova

Nedilko

Slepets

et al. 2018

Physica Status Solidi (a)

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The paper reports experimental results on features of crystal structure and luminescent properties of the Eu1−xCayVO4 nanoparticles synthesized for the first time. The Eu1−xCaxVO4 compounds with x = 0, 0.05, 0.1, 0.15, and 0.20 are prepared by aqueous nitrate–citrate sol–gel synthesis. The obtained samples are characterized by XRD analysis. The Eu1−xCaxVO4 samples are crystallized in tetragonal structure. Phase composition of the sample depends on the x value. Increasing concentrations of the calcium ions leads to formation of the EuVO4 and CaV2O6 phases’ mixture. Luminescence properties of the synthesized Eu1−xCaxVO4 nanoparticles are considered in comparison with properties of the La1−x−yEuyCaxVO4 nanoparticles. Formation of two types of emission centers and arising of additional excitation band near 400 nm are observed for the both compositions. It is shown that second types of the emission centers have different structure and spectral characteristics for the Eu1−xCaxVO4 and La1−x−yEuyCaxVO4 nanoparticles, whereas the 400 nm excitation band has the same origin for the both compositions.

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“…Recently, the synthesis and luminescence properties of selfactivated yellow-green emitting vanadate phosphor Na 2 YMg 2 V 3 O 12 with garnet structure were reported [12]. However, to the best of our knowledge, the effect of Eu 3+ doping in Na 2 YMg 2 V 3 O 12 host has not been reported so far.…”

Section: Introductionmentioning

confidence: 96%

Energy transfer and tunable luminescence of Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphors for white LED applications

Zheng

Tang

2016

Materials Research Bulletin

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Luminescence of the self-activated vanadate phosphors Na2LnMg2V3O12 (Ln=Y, Gd)

Cited by 60 publications

References 28 publications

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light

Energy transfer and tunable luminescence of Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphors for white LED applications

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Luminescence of the self-activated vanadate phosphors Na2LnMg2V3O12 (Ln=Y, Gd)

Cited by 60 publications

References 28 publications

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Synthesis and Properties of the La1 − x − y Eu y Ca x VO4 (0 ≤ x, y ≤ 0.2) Compounds

Synthesis and Investigation of La,Ca ‐Doped EuVO4 Nanoparticles with Enhanced Excitation by Near Violet Light

Energy transfer and tunable luminescence of Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphors for white LED applications

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Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light