Eu2+, Eu2+ and Gd3+ co-doped SrAl2O4 phosphors are synthesized by solid-state reaction method. Their structure, composition and luminescent properties are investigated by utilizing X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) analysis and photoluminescence spectra. The result shows that introduction of Eu2+ and Gd3+ does not change the crystal structure. The average crystallite sizes of phosphors are, 46.1 nm for SrAl2O4: Eu2+ and 40.4 nm for SrAl2O4: Eu2+, Gd3+. The XPS results indicate all peaks of these elements are consistent with standard corresponding central values of those intensity peaks. The phosphor can be excited by broadband ultraviolet and partial visible light (300-480 nm) effectively and emits green or blue light that is related to the characteristic emission of Eu2+ due to 4f(6)5d(1)-4f(7) transitions. The optimal doping concentrations of phosphors SrAl2O4: Eu2+, Eu2+ and Gd3+ are 3.5 mol%, 3.5 mol% and 12 mol%, respectively. (C) 2013 Elsevier B.V. All rights reserved.
部门归属
[feng, wen-lin] chongqing univ technol, dept appl phys, chongqing 400054, peoples r china. [feng, wen-lin] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.
; feng, wl (reprint author), chongqing univ technol, dept appl phys, chongqing 400054, peoples r china.
; wenlinfeng@126.com
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