Luminescence of NaGdFPO4:Ln after VUV excitation: A comparison with GdPO4:Ln (Ln=Ce, Tb) |
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| Authors: | Zifeng Tian Huihong Lin Bei Guo Yibing Fu |
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| Institution: | a State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China
b National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, PR China |
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| Abstract: | The phosphors NaGdFPO4:Ln3+ and GdPO4:Ln3+ (for Ln3+=Ce3+ and Tb3+) were prepared by solid-state reaction technique, the VUV-vis spectroscopic properties of the phosphors were investigated, and we vividly compare the luminescence of Ce3+ and Tb3+ in the hosts. For phosphors GdPO4:Ln3+, the band near 155 nm in VUV excitation spectrum is assumed to be the host-related absorption, and for NaGdFPO4:Ln3+ the absorption is moved to longer wavelength, near 170 nm, showing the P-O bond covalency increased after fluoridation. The f-d transitions of Ce3+ and Tb3+ in the host lattices are assigned and corroborated, and it was found that the 5d states are with lower energy in NaGdFPO4:Ln3+ than those in GdPO4:Ln3+. For fluoridation of GdPO4:Ln3+ to NaGdFPO4:Ln3+, the energy change of Ln3+ (Ln=Ce, Tb) 5d states is consistent with that of host-related absorption. |
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| Keywords: | Luminescence Vacuum ultraviolet f-d transition Ce3+ Tb3+ NaGdFPO4 GdPO4 |
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