Person: ERDEM, MURAT
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ERDEM
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MURAT
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Publication Metadata only Molten salt synthesis and optical properties of Eu3+, Dy3+ or Nd3+ doped NiNb2O6 columbite-type phosphors(ELSEVIER SCI LTD, 2015) BAŞAK, ALİ SADİ; Elmekci, Mete Kaan; Erdem, Murat; Basak, Ali Sadi; Ilhan, Mustafa; Mergen, AyhanPure, Eu3+, Dy3+ or Nd3+-doped NiNb2O6 powders have been prepared by a molten salt synthesis method by using Li2SO4-Na2SO4 salt mixture as a flux at relatively low temperatures as compared to the solid state reaction method. X-ray diffraction patterns of pure NiNb2O6 samples indicated an orthorhombic single phase. For Eu3+-doped NiNb2O6 samples, the luminescence of Eu3+ was observed at 615 nm as red emission while Dy3+-doped NiNb2O6 showed yellow emission at 577 nm and Nd3+ doped sample exhibited a typical emission at 1064 nm varying with the Eu3+ or Nd3+ doping concentrations. These luminescence characteristics of the doped samples may be attributed to the energy transfer between rare earth ions and NiO6 octahedral groups in the columbite structure. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.Publication Metadata only Molten salt synthesis, visible and near-IR region spectral properties of europium or neodymium doped CoNb2O6 columbite niobate(ROYAL SOC CHEMISTRY, 2015) BAŞAK, ALİ SADİ; Ekmekci, Mete Kaan; Erdem, Murat; Basak, Ali SadiPure Nd3+- or Eu3+-doped CoNb2O6 powders have been prepared by a molten salt synthesis method using a Li2SO4-Na2SO4 or NaCl-KCl salt mixture as a flux at relatively low temperatures as compared to the solid state reaction method. X-ray diffraction patterns of pure CoNb2O6 samples indicated an orthorhombic single phase. For Eu3+-doped CoNb2O6 samples, the luminescence of Eu3+ was observed at 615 nm as red emission while the Nd3+ doped sample showed a typical emission at 1064 nm varying with the Eu3+ or Nd3+ doping concentrations. These luminescence characteristics of the doped samples may be attributed to the energy transfer between rare earth ions and CoO6 octahedral groups in the columbite structure.Publication Metadata only Structural and optical properties of Nd3+ doped columbite SrNb2O6(ELSEVIER GMBH, 2016) BAŞAK, ALİ SADİ; Ekmekci, Mete Kaan; Erdem, Murat; Basak, Ali Sadi; Danis, OzkanNd-doped SrNb2O6 particles have been prepared by a molten salt method using strontium nitrate, niobium oxide and NaCl-KCl salt mixture as a flux at a relatively low temperature as compared to solid-state reaction method. X-ray diffraction patterns of the pure SrNb2O6 samples exhibited a single orthorhombic phase. Photoluminescence (PL) properties of Nd-doped samples in near-infrared spectral region were studied in detail. A characteristic luminescence of Nd3+ at 1.06 mu m was observed for Nd-doped SrNb2O6. Concentration quenching phenomenon was detected depending on the Nd-doping concentrations at room temperature. This characteristic of the doped samples may be ascribed to the energy transfer between Nd3+ and niobate groups (NbO6). (C) 2016 Elsevier GmbH. All rights reserved.