Synthesis and Luminescent Properties of Nano-scale Y2Si2O7:Re3+ (Re=Eu, Tb) Phosphors via Sol-Gel Method |
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| Authors: | Yong Li Bao-gui You Wei Zhao Wei-ping Zhang Min Yin |
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| Affiliation: | Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China; Department of Physics, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China; Department of Physics, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | By using metal nitrates as starting materials and citric acid as a complexing agent, Y2Si2O7:Re3+ (Re=Eu, Tb) phosphors were prepared by a sol-gel method. X-ray diffraction was employed to characterize the resulting samples. The results of XRD indicate that the ff-Y2Si2O7 nanocrystal with size of 27 nm is obtained at 1000 oC and the doping ion content does not influence the structure. The excitation spectra in the UV and VUV ranges and the emission spectra of Re3+ doped samples were measured. The excitation spectra in the VUV range is due to absorption of host, that in the UV range is ascribed to absorption transitions from 4f to 5d state of the Tb3+ and the charge transfer in the Eu3+-O2- bond. The spectral energy distribution of the Tb3+ emission depends strongly on the Tb3+ concentration. The dependence of photoluminescence intensity on Re3+ concentration is also discussed in detail. The fluorescent decay curves at room temperature were measured and analyzed. |
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| Keywords: | Luminescence Sol-gel Y2Si2O7 Rare earth |
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