At low temperature, some long-lasting phosphors could not work well in practical applications. So it is necessary to investigate the temperature dependence of the phosphors. The Y2O2S.Eu, Ti, Mg microcrystalline sampl...At low temperature, some long-lasting phosphors could not work well in practical applications. So it is necessary to investigate the temperature dependence of the phosphors. The Y2O2S.Eu, Ti, Mg microcrystalline samples were prepared by solid state reaction method. Phosphors were sintered at 1150 ℃ for 20 min in air, putting in and taking out both at high temperature. The emission spectra and the afterglow spectra as well as the thermoluminescence curve were measured for Y2O2S：Eu,展开更多
A new kind of doped rare earth free phosphor Y 2O 2S∶xTi (0<x≤0.10) with doped Ti as activative center was synthesized by solid state reaction and sintered at 1200 ℃ for 2.5 h under reducing atmosphere. XRD pa...A new kind of doped rare earth free phosphor Y 2O 2S∶xTi (0<x≤0.10) with doped Ti as activative center was synthesized by solid state reaction and sintered at 1200 ℃ for 2.5 h under reducing atmosphere. XRD patterns, photoluminescence spectra, time-resolved phosphorescence spectra and decay curves of the phosphor were investigated. XRD results reveal that a single Y 2O 2S phase exists with Ti content up to 6% (mol fraction). Yellow long lasting phosphorescence for present materials was observed in the dark with naked eye after the removal of the excitation light. From the time-resolved phosphorescence spectra the broad emission band centered at 565 nm was confirmed to be responsible for the long lasting phosphorescence which could maintain above 1 h. The possible mechanism responsible for the long lasting phosphorescence of the Y 2O 2S∶Ti phosphor was proposed.展开更多
Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source....Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source. The experiment of the emission and excitation optical spectrum, decay curve of fluorescence and residuals for several sensitive materials confirms the match of Y2O2S:Eu using the light source and the feasibility of the system. The rare earth material Y2O2S:Eu is selected as the material candidate for being the most sensitive.展开更多
文摘At low temperature, some long-lasting phosphors could not work well in practical applications. So it is necessary to investigate the temperature dependence of the phosphors. The Y2O2S.Eu, Ti, Mg microcrystalline samples were prepared by solid state reaction method. Phosphors were sintered at 1150 ℃ for 20 min in air, putting in and taking out both at high temperature. The emission spectra and the afterglow spectra as well as the thermoluminescence curve were measured for Y2O2S：Eu,
文摘A new kind of doped rare earth free phosphor Y 2O 2S∶xTi (0<x≤0.10) with doped Ti as activative center was synthesized by solid state reaction and sintered at 1200 ℃ for 2.5 h under reducing atmosphere. XRD patterns, photoluminescence spectra, time-resolved phosphorescence spectra and decay curves of the phosphor were investigated. XRD results reveal that a single Y 2O 2S phase exists with Ti content up to 6% (mol fraction). Yellow long lasting phosphorescence for present materials was observed in the dark with naked eye after the removal of the excitation light. From the time-resolved phosphorescence spectra the broad emission band centered at 565 nm was confirmed to be responsible for the long lasting phosphorescence which could maintain above 1 h. The possible mechanism responsible for the long lasting phosphorescence of the Y 2O 2S∶Ti phosphor was proposed.
基金supported by the National Natural Science Foundation of China (Grant Nos. 50775198, 60102002, 60974115 and 60977061)the Youth Foundation of Education Bureau of Hebei Province (Grant No.2011225)
文摘Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source. The experiment of the emission and excitation optical spectrum, decay curve of fluorescence and residuals for several sensitive materials confirms the match of Y2O2S:Eu using the light source and the feasibility of the system. The rare earth material Y2O2S:Eu is selected as the material candidate for being the most sensitive.
