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Lanthanide doped bismuth tungstates: an investigation for led and photocatalysis applications

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In this work, we studied optical, photocatalytic and photoelectrochemical properties of a series of lanthanide-doped double layered Aurivillius type bismuth oxides. The visible-light harvesting photocatalysts doped with Eu, Pr, Nd, Tm, Ho and Ce ions were synthesized by solid-state synthesis method. Doping amount was varied between 0.2-to-10 percent. X-ray diffraction (XRD) analysis revealed that lanthanide atoms were incorporated into the Bi2W2O9 lattice successfully up to 5%. Higher dopant ratios resulted in formation of secondary phases. Particles crystallized in micro-platelet morphology. Furthermore, luminescence of Pr3+ and Eu3+ ion doped catalysts are evaluated and the study showed that red emission intensity of Pr3+ doped powder is 29 times higher than that of Eu3+ doped ceramics. Lanthanide doped powders absorb in the visible regions. Especially, doping double layered bismuth oxide with Ce significantly narrowed down the band gap from ~3.3 eV to ~2.1 eV. Photoelectrochemical behaviour of the powders was also investigated and rare-earth dependent enhanced photocurrent production is demonstrated. Best photoelectrochemical response is achieved with Tm3+ ion doped sample.

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Eskişehir Teknik Üniversitesi

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Chemistry, Kimya

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Eskişehir Technical University Journal of Science and and Technology A- Applied Sciences and Engineering

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10.18038/aubtda.412443

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