Microwave-assisted synthesis of BaWO4 nanoparticles and its photoluminescence properties

Shen, Yanhua; Wen, Li; Li, Taohai

doi:10.1016/j.matlet.2011.06.033

Cited by 42 publications

(13 citation statements)

References 24 publications

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“…The spectra show a violet-blue emission band in range of ~370-450 nm. This is similar with the blue-green luminescence reported for MeWO 4 powders in previous literature (Thongtem et al, 2008;Campos et al, 2007;Shen et al, 2011;Li et al, 2014). Figure 5 shows the luminescence spectra of Sm 3+ in the phosphors under monitoring emission at 643 nm and excitation at 404 nm.…”

Section: Resultssupporting

confidence: 88%

Doping level effect on the luminescence efficiency of Sm3+-doped BaWO4 phosphors prepared by sol-gel process

2016

IJMSI

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Abstract:The Sm-doped BaWO 4 phosphor powders with Sm content of 0-7.5 at.% were fabricated with a sol-gel method. X-ray diffraction analysis, scanning electron microscopy, and photoluminescence spectra analysis were used to characterise the microstructural and photoluminescence efficiency. The effect of Sm doping level was studied. A granular particle morphology and decreased nanoscale average particles size with increasing Sm-doping level were observed. The matrix showed weak violet-blue emission. The Sm 3+ in the BaWO 4 matrix showed red emission that is obviously stronger than violet-blue emission of the matrix. A maximal doping level of Sm 3+ cation was observed for a highest emission efficiency of Sm 3+ cation.

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Section: Resultssupporting

confidence: 88%

Doping level effect on the luminescence efficiency of Sm3+-doped BaWO4 phosphors prepared by sol-gel process

2016

IJMSI

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“…The PL intensity is controlled by the number of charged transfers and surface defects. Moreover, the emission peaks obviously shift to the region of long wavelength which may be due to the particle-forming effect and the increased size of nanoparticles [46,47]. …”

Section: Resultsmentioning

confidence: 99%

Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Zawawi

Yahya

Hassan

et al. 2013

Chemistry Central Journal

131

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BackgroundMetal tungstates have attracted much attention due to their interesting structural and photoluminescence properties. Depending on the size of the bivalent cation present, the metal tungstates will adopt structures with different phases. In this work, three different phases of metal tungstates MWO4 (M= Ba, Ni and Bi) were synthesized via the sucrose templated method.ResultsThe powders of BaWO4 (tetragonal), NiWO4 (monoclinic) and Bi2WO6 (orthorhombic) formed after calcination temperatures of 750, 650 and 600°C for 4 h respectively are found to be crystalline and exist in their pure phase. Based on Scherrer estimation, their crystallite size are of nanosized. BET results showed NiWO4 has the highest surface area. BaWO4 exhibited less Raman vibrations than the NiWO4 because of the increased lattice symmetry but Bi2WO6 showed almost the same Raman vibrations as BaWO4. From the UV-vis spectra, the band gap transition of the metal tungstates are of the order of BaWO4 > Bi2WO6 > NiWO4. Broad blue-green emission peaks were detected in photoluminescence spectra and the results showed the great dependence on morphology, crystallinity and size of the metal tungstates.ConclusionThree different phases of metal tungstates of BaWO4 (scheelite), NiWO4 (wolframite) and Bi2WO6 (perovskite layer) in their pure phase were successfully prepared by the simple and economical sucrose-templated method. The highest surface area is exhibited by NiWO4 while largest band gap is shown by BaWO4. These materials showed promising optical properties.

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“…As per the reported literature, the metal tungstates can exhibit blue PL spectra due to the charge transfer transition of the tetrahedral [WO 4 ] 2group [41]. The emission peaks of BaWO 4 nanoparticles may be responsible for blue shift in the PL spectra which may be due to the quantum size effect of the nanoparticles [42,43].…”

Section: Optical Propertiesmentioning

confidence: 88%

Soft chemical synthesis and characterization of BaWO4 nanoparticles for photocatalytic removal of Rhodamine B present in water sample

Sadiq

Nesaraj

2014

J Nanostruct Chem

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In recent years, the use of metal oxides as photocatalysts for degradation of organic substances has attracted the attention of the scientific community. Metal oxide nanoparticles have been studied due to their novel optical, electronic, magnetic, thermal and potential applications as catalysts, gas sensors, photo-electronic devices, etc. In this research work, we report a simple, soft chemical route for synthesizing BaWO 4 nanoparticles using cheap chemicals such as barium nitrate (precursor salt) and sodium tungstate (precipitating agent). The final product was dried at room temperature overnight and calcined at 400°C and 800°C for 2 h to get phase-pure product. The prepared nanoparticles (as prepared and heat-treated samples) were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis and UV-Vis spectroscopy techniques. Photocatalytic degradation characteristics of Rhodamine B in water using BaWO 4 nanoparticles were studied and reported.

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Microwave-assisted synthesis of BaWO4 nanoparticles and its photoluminescence properties

Cited by 42 publications

References 24 publications

Doping level effect on the luminescence efficiency of Sm<SUP align="right">3+</SUP>-doped BaWO<SUB align="right">4 phosphors prepared by sol-gel process

Doping level effect on the luminescence efficiency of Sm<SUP align="right">3+</SUP>-doped BaWO<SUB align="right">4 phosphors prepared by sol-gel process

Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Soft chemical synthesis and characterization of BaWO4 nanoparticles for photocatalytic removal of Rhodamine B present in water sample

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