Molten salt synthesis and spectral properties of Nd³⁺ doped CdNb₂O₆ columbite phosphors

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• 作者：Mete Kaan Ekmek莽i ; Murat Erdem ; Ayhan Mergen ; G枚n眉l 脰zen ; Baldassare Di Bartolo
• 关键词：Columbite niobates ; Phosphors ; Molten salt route ; Concentration quenching
• 刊名：Journal of Alloys and Compounds
• 出版年：5 April, 2014
• 年：2014
• 卷：591
• 期：Complete
• 页码：230-233
• 全文大小：1641 K

文摘

Pure and Nd-doped CdNb₂O₆ particles have been prepared by a molten salt method using cadmium nitrate, niobium oxide and Li₂SO₄-Na₂SO₄ salt mixture as a flux at a relatively low temperature as compared to solid-state reaction method. X-ray diffraction patterns of the pure CdNb₂O₆ samples exhibited a single orthorhombic phase. Photoluminescence (PL) properties of all the undoped and Nd-doped samples in visible and near-infrared spectral region were studied in detail. While a strong blue emission band centered at 460 nm at room temperature was observed for the pure CdNb₂O₆, additional characteristic luminescence of Nd³⁺ at 1.06 渭m was observed for Nd-doped CdNb₂O₆. Concentration quenching phenomenon was detected depending on the Nd-doping concentrations at both room and relatively low temperatures. This characteristic of the doped samples may be ascribed to the energy transfer between Nd³⁺ and niobate groups (NbO₆).