Solution synthesis of Y1−xBixVO4 for optical applications (original) (raw)
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Structural and luminescent properties in YVO4:Dy3+ Bi3+ phosphors
DAE SOLID STATE PHYSICS SYMPOSIUM 2018, 2019
Dy 3+-Bi 3+ codoped YVO4 (YVO4: 3at%Dy 3+ , xBi 3+) phosphors have been synthesize and subsequently characterized by XRD, sem, and photoluminescence spectroscopy to study the simultaneous effect of activator and sensitizer on the luminescent properties of the said phosphor. One significant outcome of the photoluminescence study involved a detailed observation of the variation in the relative intensity of the 4 F9/2-6 H13/2 transition with respect to the 4 F9/2-6 H15/2 transition of Dy 3+ in YVO4: Dy 3+. The observations in this case were subsequently explained on the basis of change in the local symmetry of the dopant ion, due to change in the host morphology etc.
EFEITO DA CONCENTRAÇÃO DOS ÍONS Eu3+ E Bi3+ NAS PROPRIEDADES FOTOLUMINESCENTE DA MATRIZ DE YVO4
Química Nova
CONCENTRATION EFFECT OF THE Eu 3+ AND Bi 3+ IN THE PHOTOLUMINESCENCE PROPERTIES OF YVO 4 MATRIX. Inorganic matrices have been extensively studied for several applications, mainly doped with lanthanoid ions presenting special spectroscopic properties. The radiation emission can be affected by several factors, such as; matrix, synthesis methodology, activating ions and sensitizers, and concentrations. Thus, in this work the matrix of yttrium vanadate doped with Eu 3+ ions as activator and Bi 3+ ions as sensitizer was prepared by the non-hydrolytic sol-gel methodology. Europium (III) and Bismuth (III) ions concentrations were varied in 1, 3 and 5% in mol with respect to the Y 3+ ion and the samples were heat treated at 1000 °C. The X-ray diffraction analyzes showed a single phase of the yttrium vanadate matrix, indicating the non-influence of the dopant ions on the crystalline structure. The dopants concentrations presented influences on the spectroscopic properties of the emitting ion, the intensity parameters (W 2 e W 4), increased as a function of the increase of Bi 3+ concentration, affecting the covalence of the bond and the rigidity of the system. The increase of Eu 3+ concentration directly affected its environment, decreasing the symmetry and increasing the quantum efficiency. Finally, increasing the dopant ions promoted the decreasing the crystallite size.
Influence of Bi3+ ions on the excitation wavelength of the YVO4:Eu3+ matrix
Optical Materials, 2016
This work used the non-hydrolytic solegel process to prepare co-activated Eu 3þ /Bi 3þ in YVO 4 phosphors. We employed X-ray diffraction, which confirmed a tetragonal structure, and photoluminescence to characterize the structure and investigate the photoluminescence properties of the YVO 4 :Eu 3þ ,Bi 3þ matrixes. The large band between 250 and 380 nm in the excitation spectrum of YVO 4 :Eu 3þ ,Bi 3þ corresponded to a ligand-metal charge transfer band (VO 4 3À / Eu 3þ). Addition of Bi 3þ ions increased the charge transfer band and intensified the emission of Eu 3þ ions. The x and y color coordinates of the phosphors ranged from 0.60 to 0.68 and from 0.32 to 0.39, respectively. The emission spectrum displayed an intense red emission centered at 618.5 nm, due to the 5 D 0 / 7 F 2 transition of Eu 3þ. The optimal Bi 3þ concentration in the phosphor was 1% in mol, which provided more intense emission and longer lifetime. The results indicated that YVO 4 :Eu 3þ ,Bi 3þ is a potential red phosphor with application as biological marker.
Luminescent YbVO4 by atomic layer deposition
Dalton transactions (Cambridge, England : 2003), 2017
UV to visible and near-infrared converting thin films of YbVO4 have been deposited by atomic layer deposition, using the precursor combinations Yb(thd)3 (thd = 2,2,6,6-tetramethyl-3,5-heptanedione) and O3, and VO(thd)2 and O3 at a deposition temperature of 240 °C, followed by post deposition annealing at 400-1000 °C. The UV absorption and the visible and near-infrared emission have been investigated in detail. The structure, thickness and composition of the deposited films have been studied by X-ray diffraction, ellipsometry, and X-ray fluorescence, respectively. The optimal pulse ratio of Yb(thd)3 and VO(thd)2 with respect to near-infrared emission was found to be 1 : 3, which also yielded the most crystalline sample after annealing. Crystallization of the films is accelerated when an excess of V2O5 is present, enabling crystallization at temperatures as low as 500 °C, probably through a flux aided process.
Journal of Solid State Chemistry, 2020
New solid solutions, Li x Y(VO 4) 1-x F 4x (0 < x 0.1), were successfully prepared via solid state reaction method by combination of orthovanadate YVO 4 (Zircon structure) and LiYF 4 fluoride (Scheelite structure). The structures were determined by X-ray diffraction and profil-matching refinements. Solid state nuclear magnetic resonance, Fourier transforms infrared and Raman spectroscopies with scanning electron microscopy were used to describe the microstructure and chemical composition of the as-prepared ceramics. It was found that solid solutions in the range 0 < x 0.1 are structurally similar to the zircon structure of YVO 4. The luminescence properties of Eu 3þ doped samples were investigated. Under excitation of 398 nm, the Li x Y 1-y Eu y (VO 4) 1-x F 4x (x ¼ 0.05, 0.07, 0.1; y ¼ 0.05, 0.10, 0.15, 0.20) solid solution exhibited red emission originating from the strongest 5 D 0 → 7 F 2 transition. As the amount of Li þ and F À contents increases, the photoluminescence efficiency improved. So, the solid solution ceramics can be considered promising red phosphors for light-emitting diodes.
Lattice parameter and luminescence properties of europium activated yttrium oxide
Solid State Communications, 2005
Samples of yttrium oxide doped with trivalent europium have been prepared by ceramic techniques, under different synthesis conditions; barium chloride (BaCl 2) and sodium tetraborate (Na 2 B 4 O 7) were tested as flux. The improvement of luminescence properties in dependence on substitution of Eu 3C for Y 3C in the host lattice, under electron and UV excitations is demonstrated. The lattice parameter as a quantitative assessment of activator incorporation degree is proposed. The obtained results are discussed with respect to the employed processing method.
Investigation of the spectroscopic properties of highly transparent Yb:(Y 0.97Zr 0.03) 2O 3 ceramic
Optical Materials, 2010
a b s t r a c t (Y 0.97Àx Zr 0.03 Yb x ) 2 O 3 (x = 0-0.15) transparent ceramics were fabricated by solid-state reaction. As ZrO 2 was introduced as additive, the transmittance of yttria ceramic was improved greatly. The optical measurements such as absorption, fluorescence spectrum and lifetime of Yb 3+ ion were carried out at room temperature. The intensities of the absorption peaks (904 and 973 nm) increase linearly with Yb 3+ ion concentration. The absorption cross-section at 973 nm and stimulated emission cross-section at 1032 nm are calculated to be 1.175 Â 10 À20 and 1.767 Â 10 À20 cm 2 , respectively. The lifetime of 5.0 at.% Yb:Y 2 O 3 ceramic is measured to be 0.93 ms. According to the emission spectra and measured lifetime, the optimum doping concentration of Yb 3+ ion in Y 2 O 3 transparent ceramic is in the range of 5.0-8.0 at.%. Meanwhile the up-conversion luminescence is also investigated.
Spectra of europium-doped yttrium oxide and yttrium vanadate phosphors
Czechoslovak Journal of Physics, 1978
The spectral distributions of the visible absorption and fluorescence emission under electron beam excitation of Eu3+-doped (Y2O3) and (YVO4) powders have been detected and analyzed. (Y2O3: Eu3+) has a cubicC crystal structure with a unit cell dimension a=10·61 Å. Its observed transitions from7F 0 to many upper states have been recognized; the observed number of Stark components is in agreement with that based on theC 2 site symmetry of the Eu3+ ion in Y2O3. Eu3+-doped yttrium vanadate has a typical zircon tetragonal crystal structure with unit cell dimensions ofc=6·29 Å anda=7·11 Å. The observed transitions in (Eu3+: YVO4) have been identified and assigned in accordance with theD 2d site symmetry of the Eu3+ ion in this lattice.
Optical Properties of Pure and Europium-doped YVO 4 Phosphor
Nanocrystals of pure and Eu-doped YVO4 phosphor is synthesized by co-precipitation method and characterized by X-ray diffraction (XRD), Fourier transform infrared red Spectroscopy (FTIR), Scanning electron microscopy (SEM) and Photoluminescence (PL). The XRD patterns showed the tetragonal phase. SEM showed that the particles are small and agglomerated. FTIR spectrum showed the characteristics of the V-O bonds ranging from 761 to 861 cm-1. The PL spectra of pure YVO4 sample showed blue emission band in the range 406-510 nm and it is attributed to the de-excitation of electrons from the filled oxygen 2p levels in the valence band to the empty vanadium 3d levels of the conduction band. The Eu-doped YVO4 sample showed strong emission at 618nm (red) at an excitation of 340nm.
New solid solution ceramics LixY1-yEuy(VO4)1-xF4x (0
Journal of Solid State Chemistry, 2020
New solid solutions, Li x Y(VO 4) 1-x F 4x (0 < x 0.1), were successfully prepared via solid state reaction method by combination of orthovanadate YVO 4 (Zircon structure) and LiYF 4 fluoride (Scheelite structure). The structures were determined by X-ray diffraction and profil-matching refinements. Solid state nuclear magnetic resonance, Fourier transforms infrared and Raman spectroscopies with scanning electron microscopy were used to describe the microstructure and chemical composition of the as-prepared ceramics. It was found that solid solutions in the range 0 < x 0.1 are structurally similar to the zircon structure of YVO 4. The luminescence properties of Eu 3þ doped samples were investigated. Under excitation of 398 nm, the Li x Y 1-y Eu y (VO 4) 1-x F 4x (x ¼ 0.05, 0.07, 0.1; y ¼ 0.05, 0.10, 0.15, 0.20) solid solution exhibited red emission originating from the strongest 5 D 0 → 7 F 2 transition. As the amount of Li þ and F À contents increases, the photoluminescence efficiency improved. So, the solid solution ceramics can be considered promising red phosphors for light-emitting diodes.