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Photoluminescence and cathodoluminescence properties of a novel CaLaGa_3O_7:Dy^(3+) phosphor

Chinese science Bulletin 2012年第7期57卷 827-831页

作者： zhao wenyu1.2. AN shengli1. fan bin1. li songbo1.& dai yatang3 1 school of metallurgical and ecological engineering, university of science and technology beijing, beijing 1.0083, china 2 school of Chemistry and Chemical engineering, Inner Mongolia university of science and technology, Baotou 014010, china 3 school of Materials science and engineering, Southwest university of science and technology, Mianyang 621000, china school of {1. and ecological engineering University of Science and Technology Beijing school of Chemistry and Chemical {1. Inner Mongolia University of Science and Technology

A single host white emitting phosphor, CaLaGa3O7:Dy3+, was synthesized by chemical co-precipitation. Field emission scanning electron microscopy, X-ray diffraction, laser particle size analysis, and photoluminescence and cathodoluminescence spectra were used to investigate the structural and optical properties of the phosphor. The phosphor particles were composed of microspheres with a slight tendency to agglomerate, and an average diameter was of about 1.0 μm. The Dy3+ ions acted as luminescent centers, and substituted La3+ ions in the single crystal lattice of CaLaGa3O7 where they were located in Cs sites. Under excitation with ultraviolet light and a low voltage electron beam, the CaLaGa3O7:Dy3+ phosphor exhibited the characteristic emission of Dy3+ (4F9/2-6H1./2 and 4F9/2-6H1./2 transitions) with intense yellow emission at about 573 nm. The chromaticity coordinates for the phosphor were in the white region. The relevant luminescence mechanisms of the phosphor are investigated. This phosphor may be applied in both field emission displays and white light-emitting diodes.

关键词：光致发光阴极射线荧光粉镝离子场发射扫描电子显微镜白色发光二极管特性 X射线衍射仪

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The luminescence properties of Sr_3Gd(BO_3)_3:Tb^(3+) phosphors under vacuum ultraviolet excitation

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Chinese science Bulletin 2012年第34期57卷 4513-4516页

作者： zhao {1. GAO SongWei AN shengli fan bin li songbo school of Chemistry and Chemical {1. Inner Mongolia University of Science and TechnologyBaotou 014010China school of {1. and ecological engineering University of Science and Technology Beijing Beijing 100083China school of Material and {1. engineering lnner Mongolia University of Science and TechnologyBaotou 014010China

Tb3+-activated Sr3Gd(BO3)3 green phosphors were prepared by conventional solid-state reaction. The vacuum ultraviolet (VUV) excitation, photoluminescence (PL) and decay properties of the phosphors in the visible range were investigated. The excitation spectrum showed a strong broad band from 1.0 to 200 nm with a maximum at 1.3 nm which was adjacent to the VUV excitation light source of 1.2 nm. Under excitation at 1.2 nm, the optimum co-doping concentration of Tb3+ was 1. mol%, and the emission intensity of Sr3Gd0.9(BO3)3:0.1.b3+ was comparable to that of commercial Zn2SiO4:Mn2+. The strongest emission peak of Sr3Gd0.9(BO3)3:0.1.b3+ was at 543 nm with chromaticity coordinates of (0.2626, 0.4922) and a lifetime of 2.32 ms. The optical properties of the green phosphor Sr3Gd(BO3)3:Tb3+ make it suitable for use in Hg-free fluorescent lamps and plasma display panels.

关键词：真空紫外线绿色荧光粉激发光源发光性能绿色荧光体发射强度无汞荧光灯固相反应

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