摘要
Ce3＋ and Tb3＋ co-doped SrSi2N2O2 phosphors were prepared by solid-state reaction. The X-ray diffraction pattern exhibited that the phosphor consisted mainly of oxygen-rich SrSi2N2O2. The optical properties of SrSi2N2O2：Ce3＋, SrSi2N2O2：Tb3＋ and SrSi2N2O2：Ce3＋,Tb3＋ were studied, respectively. The emission intensity of Tb3＋ at 541 nm was remarkably enhanced by Ce3＋ in SrSi2N2O2：Ce3＋,Tb3＋ phosphor, which was attributed to the energy transfer from Ce3＋ to Tb3＋. The chromaticity coordinates of phosphors were investigated as a function of Tb3＋ concentration. When the Ce3＋ and Tb3＋ concentrations were 0.02 and 0.18 mol per formula unit, respectively, the chromaticity coordinate was （0.257, 0.337） in the CIE 1931 chromaticity diagram. SrSi2N2O2Ce3＋,Tb3＋ phosphors could be used for white light emitting diodes.
Ce3＋ and Tb3＋ co-doped SrSi2N2O2 phosphors were prepared by solid-state reaction. The X-ray diffraction pattern exhibited that the phosphor consisted mainly of oxygen-rich SrSi2N2O2. The optical properties of SrSi2N2O2：Ce3＋, SrSi2N2O2：Tb3＋ and SrSi2N2O2：Ce3＋,Tb3＋ were studied, respectively. The emission intensity of Tb3＋ at 541 nm was remarkably enhanced by Ce3＋ in SrSi2N2O2：Ce3＋,Tb3＋ phosphor, which was attributed to the energy transfer from Ce3＋ to Tb3＋. The chromaticity coordinates of phosphors were investigated as a function of Tb3＋ concentration. When the Ce3＋ and Tb3＋ concentrations were 0.02 and 0.18 mol per formula unit, respectively, the chromaticity coordinate was （0.257, 0.337） in the CIE 1931 chromaticity diagram. SrSi2N2O2Ce3＋,Tb3＋ phosphors could be used for white light emitting diodes.
基金
Project supported by the National Natural Science Foundation of China (51072190)
Program for New Century Excellent Talents in University (NCET-07-0786)
Zhejiang Province Science and Technology Program (2009C21020)
Yunnan Province Science and Technology Program (2010CD095)
the Fund of State Key Lab of Crystal Materials (KF1007)
