Influence of Zn1-xCaxWO4 heterostructures synthesized by spray pyrolysis on photoluminescence property

Santiago, A.A.G.; Fernandes, Y.L.R.L.; Tranquilin, R. L.; Longo, E.; Paskocimas, C. A.; Motta, F. V.; Bomio, M. R. D.

doi:10.1016/j.ceramint.2019.08.022

Cited by 14 publications

(2 citation statements)

References 68 publications

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“…No additional peaks were identified, showed only the tetragonal phase and so the doping occurred satisfactorily. SrMoO 4 , CaWO 4 , ZnMoO 4 , BaMoO 4 , ZnWO 4 were synthesized in different methods with or without rare earth doping and showed to be excellent host matrices due to their being obtained with high purity and without the presence of secondary oxides [39][40][41][42]. Molybdates and tungstates have a matrix with excellent capacity to host dopants, especially in the hosting of rare earth.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Santiago

Macedo

Oliveira

et al. 2020

J Mater Sci: Mater Electron

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In the present paper, BaWO 4 :xTm 3+ ,yPr 3+ samples were synthesized by the ultrasonic spray pyrolysis process and the effect of doping on the structural and optical properties were analyzed. All XRD patterns were indexed by the scheelitetype tetragonal structure, without the presence of secondary phases, suggesting success in the Tm 3+ and Pr 3+ doping. The FESEM images showed than particles have sphere-like morphology with the presence of holes, irregularity, and pores on their surfaces. The bandgap of the BaWO 4 :xTm 3+ ,yPr 3+ sample varied between 5.50 and 5.58 eV. The doping of Tm 3+ and Pr 3+ resulted in a reduction in the photocatalytic activity can be linked to a decrease of effective masses ratio electron/hole and an increase in the recombination rate.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Santiago

Macedo

Oliveira

et al. 2020

J Mater Sci: Mater Electron

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show abstract

“…Ternary metal tungstates have been investigated in the field of luminescent materials, due to their selfactivating fluorescence effect, optical properties, and high stability. [21][22][23] Calcium tungstate (CaWO 4 ) is a wellknown self-activating luminescence material with tetragonal scheelite structure, which exhibits intrinsic blue emission when excited by ultraviolet irradiation or X-ray. 24,25 In scheelite-type CaWO 4 phosphor crystallizes, the Ca 2+ with S 4 point symmetry is coordinated by eight O atoms.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Cheng

Zhang

Xue

et al. 2021

J of Applied Polymer Sci

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The alginate-based calcium tungstate composite was fabricated by a facile and eco-friendly one-step crosslinking process combining with the freeze-drying method. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscope, X-ray diffraction, thermogravimetric analysis, UV-vis diffuse reflectance spectrum and photoluminescence (PL) were employed to characterize the structures, morphologies, thermal stabilities, and optical properties of the synthesized composite materials. The obtained results demonstrate that the alginate-based calcium tungstate composite presented a special porous network architecture with tetragonal scheelite-type calcium tungstate microspheres attached. A possible synthesis mechanism was proposed based on the experimental data. Moreover, the PL data confirmed the broadband emission of the composite with its maximum at 438 nm that located in the blue emitting region. This study provides the alginate-based calcium tungstate composite with unique morphology and good thermal stability as well as lays a foundation for its application in the field of PL.

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Preparation and luminescence properties of ZnWO₄:Eu³⁺,Tb³⁺ phosphors

Zou

Wang

2021

Luminescence

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A series of ZnWO4:Eu3+,Tb3+ phosphors was prepared using a co‐precipitation method at room temperature. The structures and luminescence properties of the materials were characterized using X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and UV–vis light, differential thermal analysis–thermogravimetric analysis, fluorescence spectra and the calculated Commission Internationale de l'Éclairage (CIE) coordinates. The results showed that the material had a monoclinic structure and the P2/c group was determined using XRD. FTIR spectroscopy confirmed the existence of W–O, Zn–O bonds, and Zn–O–W groups in WO6 and ZnO6 octahedra. In the excitation spectrum, there was an overlap of the broad band charge transfer bands belonging to O2−→W6+ and O2−→Eu3+ or O2−→Tb3+ transitions in the range 200–325 nm, and excitation bands between 350 and 500 nm belonged to the characteristic absorption bands for Eu3+ and Tb3+. Therefore, the phosphor can be used as a single component tunable phosphor in light‐emitting diodes.

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Influence of Zn1-xCaxWO4 heterostructures synthesized by spray pyrolysis on photoluminescence property

Cited by 14 publications

References 68 publications

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Preparation and luminescence properties of ZnWO₄:Eu³⁺,Tb³⁺ phosphors

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Influence of Zn1-xCaxWO4 heterostructures synthesized by spray pyrolysis on photoluminescence property

Cited by 14 publications

References 68 publications

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

Facile synthesis of alginate‐based calcium tungstate composite: A thermally stable blue emitting phosphor

Preparation and luminescence properties of ZnWO4:Eu3+,Tb3+ phosphors

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Preparation and luminescence properties of ZnWO₄:Eu³⁺,Tb³⁺ phosphors