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Ionic liquid-assisted hydrothermal synthesis of dendrite-like NaY(MoO4)2:Tb phosphor |
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| Authors: | Yue Tian Baojiu Chen Bining Tian Jiashi Sun Xiangping Li Jinsu Zhang Lihong Cheng Haiyang Zhong Hua Zhong Qingyu Meng Ruinian Hua |
| Institution: | 1. Department of Physics, Dalian Maritime University, Dalian, Liaoning 116026, PR China;2. College of Life Science, Dalian Nationalities University, Dalian, Liaoning 116600, PR China;3. School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China |
| Abstract: | Micro-sized NaY(MoO4)2:Tb3+ phosphors with dendritic morphology was synthesized by a ionic liquid-assisted hydrothermal process. X-ray diffraction (XRD) indicated that the as-prepared product is pure tetragonal phase of NaY(MoO4)2. Field emission scanning electron microscopy (FE-SEM) images showed that the as-prepared NaY(MoO4)2:Tb3+ phosphors have dendritic morphology. The photoluminescent (PL) spectra displayed that the as-prepared NaY(MoO4)2:Tb3+ phosphors show a stronger green emission with main emission wavelength 545 nm corresponding to the 5D4→7F5 transition of Tb3+ ion, and the optimal Tb3+ doping concentration for obtaining maximum emission intensity was confirmed to be 10 mol%. Based on Van Uitert's and Dexter's models the electric dipole–dipole (D–D) interaction was confirmed to be responsible for the concentration quenching of 5D4 fluorescence of Tb3+ in the NaY(MoO4)2:Tb3+ phosphors. The intrinsic radiative transition lifetime of 5D4 level is found to be 0.703 ms. |
| Keywords: | Ionic liquid NaY(MoO4)2:Tb3+ Phosphor Luminescence |
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