Intrinsic [VO4]3− emission of cesium vanadate Cs5V3O10

Pu, Yinfu; Huang, Yanlin; Tsuboi, Taijū; Han, Cheng; Seo, Hyo Jin

doi:10.1039/c5ra11823a

Cited by 20 publications

(7 citation statements)

References 37 publications

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“…In the UV region, broad and strong bands of all the samples could be attributed to charge transfer (CT) transitions inside VO states. Then, in all the vanadates, the transitions 1 A 1 / ( 1 T 1 , 1 T 2 ) give rise to a broad and intense CT absorption band in the UV region [24]. However, as it can be seen from Fig.…”

Section: Resultsmentioning

confidence: 85%

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Jovanović

Chiappini²,

Żur

et al. 2018

Optical Materials

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In this work, we focused on the syntheses, structure and spectroscopic properties of GdVO4:Dy 3þ and DyVO4 (nano)particles of different sizes and shapes (spherical nanoparticles of 2 nm, 4 nm, and 20 nm in size, nanorods with a few nanometers in diameter and up to 10e20 nm in length and microparticles of 1 e8 mm) obtained by four synthetic methods. The size effect on the structure, Raman active modes, and photoluminescence emission intensities was analyzed by X-ray diffraction, Raman and photo-luminescence spectroscopy, scanning and transmission electron microscopy, and diffuse reflection spectroscopy. All Xray diffraction patterns clearly indicated presence of a single tetragonal zircon-type phase; absence of impurity phases indicate that the dopant Dy 3þ ions were successfully and uniformly incorporated into the GdVO4 host lattice due to the equal valence and similar ionic radii. Micro-Raman measurements support the XRD measurements and showed Raman-active modes of the REVO4 systems (RE ¼ Gd, Dy). The difference between the two hosts in the diffuse reflectance spectra was observed and it could be attributed to more effective Gd 3þ ions on the charge transfer bands and different polarization (compared to bulk material) in smaller nanoparticles. Photoluminescence spectroscopy showed several bands in the visible and near-infrared regions which can be exclusively attributed to the fef transitions of Dy 3þ ions. .

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Section: Resultsmentioning

confidence: 85%

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Jovanović

Chiappini²,

Żur

et al. 2018

Optical Materials

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“…According to this figure, the obtained particles sizes are mainly in the order of 5 -25 nm. This very small sizes of particle less than 1 μm indicates success and sensation of micro-particle synthesis [25]. In addition the Lorentizian fit shows that Cs and Y are distributed equally over the whole sample.…”

Section: Scanning Electron Microscope Analysismentioning

confidence: 82%

Ionic conductivity and optical properties of self-activated phosphor CsYP2O7

Karray

OUESLETI

Khirouni

et al. 2020

Preprint

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Pyrophosphates are interesting compounds as optical materials, ionic conductors, solid electrolytes, battery electrodes, solid-state lasers and active layer for sensors. In this context, the compound CsYP 2 O 7 has been synthesized by the solid-state reaction method. The X-ray powder diffraction at room temperature confirmed the phase formation of the synthesized compound in the monoclinic phase. The composition and morphology were performed by energy dispersive spectroscopy coupled with scanning electron microscope . The optical properties of the compound were studied by UV–Vis absorption spectroscopy. By direct investigation of the UV absorption measurements and using the Tauc model, we have found that the direct optical band gap is equal to 3.7eV. Two of the relaxation mechanisms were clearly identified from Nyquist plots and modulus analysis, which can be discerned to both grain and grain boundary contributions effect. The obtained results were analyzed by fitting the experimental data to an equivalent circuit model.Bulk resistance and grain boundary resistance decreased with the increase of temperature, which confirmed negative temperature coefficient of resistance behavior. The same values of activation energies obtained from the impedance (0.43 eV ) and hopping frequency (0.42 eV),prove that the transport happens through an ion hopping mechanism dominated by the motion of the Cs + cations in the structure of the CsYP 2 O 7 material. The results confirm tha the synthesized compound is suitable for catalysis and optoelectronic applications.

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“…The photoluminescence emission of vanadate-based compounds has been associated with charge transfer transitions from the oxygen ligands O 2− to the central vanadium ions V 5+ in [VO 4 ] tetrahedra, as well as complex cluster vacancies and/ or modified lattices. 68,69 However, all these explanations are directly associated with VO The PL bands arise from photogenerated electron-hole pair processes and the electronic transition between the VB (2p levels of O atoms and 4d levels of Ag atoms) and the CB (3d levels of V atoms). Breaking symmetry processes in these clusters with distortions and tilts create a huge number of different structures and subsequently different material properties related to local (short), intermediate, and long-range structural order-disorder.…”

Section: Micro-raman Spectroscopy Analysismentioning

confidence: 99%

Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights

et al. 2016

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This work combines experimental and computational techniques to exploit the best of both methodologies and thus provide a tool for understanding the geometry, cluster coordination, electronic structure, and optical properties of Ag4V2O7 crystals. This tool has been developed to create structural models and enable a much more complete and rapid refinement of 3D (Third Dimension) structures from limited data, aiding the determination of structure-property relationships and providing critical input for materials simulations. Ag4V2O7 crystals were synthesized by a simple precipitation method from aqueous solution at 30 °C for 10 min. The obtained crystals were characterized by X-ray diffraction (XRD) and Rietveld refinement, and micro-Raman spectroscopy. The crystal morphology was determined by field emission scanning electron microscopy (FESEM), and the optical properties were investigated by ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy and photoluminescence (PL) measurements. The geometric and electronic structures of Ag4V2O7 crystals were investigated by first-principles quantum-mechanical calculations based on the density functional theory. The theoretical results meet the experimental data to confirm that Ag4V2O7 crystals have an orthorhombic structure, and that the building blocks of the lattice comprise two types of V clusters, [VO4] and [VO5], and two types of Ag clusters, [AgO5] and [AgO6]. This type of fundamental studies, which combine multiple experimental methods and first-principles calculations, have been proved valuable to obtain a basic understanding of the local structure, bonding, electronic, and optical properties of Ag4V2O7 crystals.

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Intrinsic [VO₄]³⁻ emission of cesium vanadate Cs₅V₃O₁₀

Cited by 20 publications

References 37 publications

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Ionic conductivity and optical properties of self-activated phosphor CsYP2O7

Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights

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Intrinsic [VO4]3− emission of cesium vanadate Cs5V3O10

Cited by 20 publications

References 37 publications

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles

Ionic conductivity and optical properties of self-activated phosphor CsYP2O7

Disclosing the electronic structure and optical properties of Ag4V2O7crystals: experimental and theoretical insights

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Product

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Intrinsic [VO₄]³⁻ emission of cesium vanadate Cs₅V₃O₁₀

Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights