Synthesis, characterization and luminescent properties of needle-like lanthanide-doped orthorhombic Y₅O₄F₇

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• 作者：Biqiu LIU ; Lisha LIU ; Kai GUO ; Jiao WANG ; Linlin ZHU ; Hui ZHANG ; Wen WEN ; Tieying YANG ; Jingtai ZHAO
• 关键词：oxyfluoride ; needle-like morphology ; luminescence ; thermal annealing ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：31
• 期：8
• 页码：745-749
• 全文大小：1093 K

文摘

Thermal annealing of YOH_1.1F_1.9 and YOH_1.1F_1.9: Ln³⁺ (Ln³⁺=Eu³⁺, Tb³⁺ and Gd³⁺) precursors in air gave access to synthesize yttrium oxyfluoride phosphors with well-preserved needle-like morphologies. The phase purities of samples strongly depended on the thermal annealing temperature. At 600 ¡ãC, pure Y₅O₄F₇ with orthorhombic structure were obtained, as evidenced by powder X-ray diffraction measurement and chemical analysis. The interesting microstructure evolution of the annealed sample from well-organized nanoparticles on curly slices to microrod-bundle structure had been aroused by raising annealing temperature. The multicolor fluorescent emissions of Y₅O₄F₇: Ln³⁺ phosphors were observed, e.g. ultraviolet emission for Gd³⁺, green emission for Tb³⁺ and red emission for Eu³⁺, which resulted from characteristic transitions of different lanthanide ions.