Thermal annealing of YOH1.1F1.9 and YOH1.1F1.9：Ln3＋ （Ln3＋=Eu3＋, Tb3＋ and Gd3＋） precursors in air gave access to synthe- size yttrium oxyfluoride phosphors with well-preserved needle-like morphologies. The phas...Thermal annealing of YOH1.1F1.9 and YOH1.1F1.9：Ln3＋ （Ln3＋=Eu3＋, Tb3＋ and Gd3＋） precursors in air gave access to synthe- size yttrium oxyfluoride phosphors with well-preserved needle-like morphologies. The phase purities of samples strongly depended on the thermal annealing temperature. At 600 ℃, 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.展开更多
基金Foundation item： Project supported by National Natural Science Foundation of China （11104298）
文摘Thermal annealing of YOH1.1F1.9 and YOH1.1F1.9：Ln3＋ （Ln3＋=Eu3＋, Tb3＋ and Gd3＋） precursors in air gave access to synthe- size yttrium oxyfluoride phosphors with well-preserved needle-like morphologies. The phase purities of samples strongly depended on the thermal annealing temperature. At 600 ℃, 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.
