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

刘必秋^1,2，刘丽莎^1,2，郭凯³，王娇⁴，朱林林^1,2，张辉¹，文闻⁵，杨铁莹⁵，赵景泰¹

1. Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics2. University of Chinese Academy of Sciences3. Max Planck Institute for Chemical Physics of Solids4. Department of Materials Science, Fudan University5. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences

摘 要：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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