Ce3＋-activated yttrium aluminum garnet （YAG） was prepared by the solid-state reaction, in which H3BO3, LiF, NaF, KF and BaF2 were used as the fluxes. The effect of fluxes on optical properties of phosphors was stud...Ce3＋-activated yttrium aluminum garnet （YAG） was prepared by the solid-state reaction, in which H3BO3, LiF, NaF, KF and BaF2 were used as the fluxes. The effect of fluxes on optical properties of phosphors was studied in detail, especially the fluxes of alkali fluorides, which could enhance the emission intensity and change the wavelength of emission peaks. Among these YAG：Ce phosphors, the phosphor sintered with H3BO3 and NaF exhibited the strongest emission. The emission peaks of phosphors prepared with fluxes from LiF to KF were shifted to long wavelength. The effect of NaF concentration on the emission intensity of YAG：Ce was also investigated. The value of emission intensity reached the maximum when the concentration of NaF was 0.5%.展开更多
The red, green, and blue upconversion properties of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses were studied under 980 nm LD excitation. The intense red （657 nm）, green （530 and 545 nm）, and blue （47...The red, green, and blue upconversion properties of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses were studied under 980 nm LD excitation. The intense red （657 nm）, green （530 and 545 nm）, and blue （476 nm） emissions were simultaneously observed at room temperature. The results showed that the mixed halide modified tellurite glass （TZFCB） had strong upconversion emissions. The effect of halide on upconversion intensity was observed and discussed, and possible upconversion mechanisms were evaluated. The intense red, green, and blue upconversion luminescence of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses might be a potentially useful material for developing three-dimensional displays applications.展开更多
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 SrSi2N...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.展开更多
基金supported by the Science Technology Project of Zhejiang Province (2008C21153)the National Natural Science Foundation of China (60508014 and 50772102)+1 种基金Program for New Century Excellent Talents in University (NCET-07-0786)the Nature Science Foundation of Zhejiang Province (R406007)
文摘Ce3＋-activated yttrium aluminum garnet （YAG） was prepared by the solid-state reaction, in which H3BO3, LiF, NaF, KF and BaF2 were used as the fluxes. The effect of fluxes on optical properties of phosphors was studied in detail, especially the fluxes of alkali fluorides, which could enhance the emission intensity and change the wavelength of emission peaks. Among these YAG：Ce phosphors, the phosphor sintered with H3BO3 and NaF exhibited the strongest emission. The emission peaks of phosphors prepared with fluxes from LiF to KF were shifted to long wavelength. The effect of NaF concentration on the emission intensity of YAG：Ce was also investigated. The value of emission intensity reached the maximum when the concentration of NaF was 0.5%.
基金supported by the National Natural Science Foundation of China (60508014 and 50772102)Program for New Century Excellent Talents in University (NCET-07-0786)the Natural Science Foundation of Zhejiang Province (R406007)
文摘The red, green, and blue upconversion properties of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses were studied under 980 nm LD excitation. The intense red （657 nm）, green （530 and 545 nm）, and blue （476 nm） emissions were simultaneously observed at room temperature. The results showed that the mixed halide modified tellurite glass （TZFCB） had strong upconversion emissions. The effect of halide on upconversion intensity was observed and discussed, and possible upconversion mechanisms were evaluated. The intense red, green, and blue upconversion luminescence of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses might be a potentially useful material for developing three-dimensional displays applications.
基金Project supported by the National Natural Science Foundation of China (51072190)Program for New Century Excellent Talents in University (NCET-07-0786)+2 种基金Zhejiang Province Science and Technology Program (2009C21020)Yunnan Province Science and Technology Program (2010CD095)the Fund of State Key Lab of Crystal Materials (KF1007)
文摘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.
