Synthesis and photoluminescent behavior of Eu3+-doped alkaline-earth tungstates

Barros, Bráulio Silva; Lima, A. C.; Silva, Z.R. da; Melo, D.M.A.; Alves-Jr, S.

doi:10.1016/j.jpcs.2011.12.026

Cited by 45 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…7,8 The second tungstate oxides exhibit a wolframite-type monoclinic structure where both M and W atoms are bonded to six oxygen atoms, which results in the formation of octahedral [MO 6 ]/[WO 6 ] clusters. 9,10 These differences in the coordination/structure cause defects in the crystal lattice and the appearance of photocatalytic, 11,12 photoluminescence (PL), [13][14][15][16] humidity sensor [17][18][19] and magnetic properties 20,21 as well as electronic properties for the tungstates.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals

et al. 2012

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of partial preferential orientation and distortions in octahedral clusters on the photoluminescence properties of FeWO4 nanocrystals

et al. 2012

View full text Add to dashboard Cite

show abstract

“…8. From the figure, it is found that all the prepared compounds exhibit broad bluegreen emission band centered at 435 nm and shoulders which are directly related to the charge transfer transitions within the [WO 4 2-] tetrahedral group [26,52,53]. In general the luminescent efficiency of semiconducting materials is strongly associated with the synthesis process influences the shape and size of the particles and crystalline nature [43,45].…”

Section: Photoluminescence Studiesmentioning

confidence: 96%

Studies on multifunctional behaviour of Cr doped SrWO4 Compounds

Muralidharan

Anbarasu

Perumal

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Transition metal doped divalent tungstate compounds endowed with coalescence of optical and magnetic property forms a class of multifunctional materials and found importance in the field of magneto-optical and spintronics device applications. In the present work, pure and Cr doped SrWO 4 compounds were synthesized by chemical precipitation method. Powder X-ray diffraction analysis reveals scheelite type tetragonal structure of all the compounds. The effect of doping on crystal symmetry and local structure of the compounds was investigated by Laser Raman spectroscopy studies. The micro sphere and polydispersed surface morphology of all the compounds were examined by scanning electron microscopy and transmission electron microscopy analysis. Further, the evidences for oxygen vacancy and oxidation states of elements present in the compounds were analyzed by X-ray photoelectron spectroscopy. The optical absorption spectra explicitly describe the distinctive shift in absorption edge and linear decrease in band gap values while increasing Cr concentrations in SrWO 4 system. The presence of defective states and oxygen vacancy in Cr doped SrWO 4 compounds were confirmed with multicolor PL emission spectra. Electron paramagnetic resonance spectra authenticates the inducement of paramagnetic center (Cr 3? ) on increasing the dopant concentration. The magnetization analysis demonstrates enhanced ferromagnetic behaviour of all the Cr doped compounds, whereas the pure SrWO 4 compound exhibits frustrated ferromagnetic behaviour. The augmented ferromagnetic ordering in Cr doped compounds has been explained in terms of carrier-induced RudermanKittel-Kasuya-Yosida interaction theory. The possible inducement of carrier mediated room temperature ferromagnetism in Cr doped SrWO 4 explicit demonstrates a hopeful candidature for magneto-optical and spintronic device applications.

show abstract

“…Rare earth doped SrWO 4 has attracted much interest and has been synthesized by solid state reaction [13], Czochralski technique [14], Pechini method [15], hydrothermal method [16], co-precipitation method [17] and solvothermal method [18]. However, these methods require high temperature which results in agglomeration of optically active lanthanides ions.…”

Section: Introductionmentioning

confidence: 99%