A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2)...A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2), and the emission peaks located at 570, 606 and 659 nm respectively. A prominent luminescence and phosphorescence in orange-red can be seen in this phosphor when illuminated with UV light or visible light. The synthesized phosphors were characterized by X-ray diffraction, the excitation and photoluminescence spectra, and the after-glow intensity decay curve. The result shows that the Y 2O 2S∶ Sm 3+ phosphor is another efficient orange-red phosphor.展开更多
Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2,...Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2, 3,4). By the cal culation of the thermoluminescence spectrum of CaWO4∶Eu, we conclude that there were two types of trap centers: VCa″ was formed by substitution of Ca2+ by Eu3 + and complex traps were produced because of substitution of W6+ by Eu3+.展开更多
文摘A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2), and the emission peaks located at 570, 606 and 659 nm respectively. A prominent luminescence and phosphorescence in orange-red can be seen in this phosphor when illuminated with UV light or visible light. The synthesized phosphors were characterized by X-ray diffraction, the excitation and photoluminescence spectra, and the after-glow intensity decay curve. The result shows that the Y 2O 2S∶ Sm 3+ phosphor is another efficient orange-red phosphor.
文摘Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2, 3,4). By the cal culation of the thermoluminescence spectrum of CaWO4∶Eu, we conclude that there were two types of trap centers: VCa″ was formed by substitution of Ca2+ by Eu3 + and complex traps were produced because of substitution of W6+ by Eu3+.
