Synthesis, characterization and luminescent properties of needle-like lanthanide-doped orthorhombic Y5O4F7 |
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| Authors: | LIU Biqiu LIU Lisha GUO Kai WANG Jiao ZHU Linlin ZHANG Hui WEN Wen YANG Tieying ZHAO Jingtai |
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| Affiliation: | [1]Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics, Shanghai 200050, China [2]University of Chinese Academy of Sciences, Beijing 100039, China [3]Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany [4]Department of Materials Science, Fudan University, Shanghai 200433, China [5]Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China |
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| Abstract: | Thermal annealing of YOH1.1F1.9 and YOH1.1F1.9: 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 °C, 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. |
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| Keywords: | oxyfluoride needle-like morphology luminescence thermal annealing rare earths |
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