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- W2383213223 abstract "The long afterglow photoluminescence materials have the particular properties storing light energy and glowing slowly at dark circumstances.That is,the materials can absorb the visible lights,store the energy,and then release the energy as the visible lights.Particularly,alkaline earth aluminates doped with rare earth ions have excellent luminescence properties such as high brightness,no radiation,safety,long duration,and environmental capability,resulting in its wide applications in many fields.In this paper,Sr1-xBaxAl2O4∶Eu2+,Dy3+(x=0,0.2,0.4,0.6,0.8,1.0)phosphors were synthesized in a reducing atmosphere by high temperature solid state method at 1 350 ℃ with H3BO3 as flux.The phosphors were characterized by X-ray diffraction(XRD).The results showed that crystal structure of the phosphors is the monoclinic phase of SrAl2O4 when x0.4 and the hexagonal phase of the BaAl2O4 when x≥ 0.4.The lattice plane distances of the phosphors increase with the content of Ba2+,which could be explained that Ba2+ ion radius is bigger than that of Sr2+ ion.The crystal lattice expands with barium ion substitution for strontium ion.Photoluminescence experiments were carried out to study luminescence properties of the phosphors under the excitation of UV.The results showed that the peak of the emission spectra shifts from 515 nm to 494 nm with the x changing from 0 to 1.0.The blue shift phenomenon could be explained by the crystal field effect,which is affected by different coulomb attractive forces due to Ba2+ ion doping in the host lattice.Long afterglow properties were investigated by thermoluminescence.Thermoluminescence measurements showed that trap energy level of the SrAl2O4 crystal structure is deeper than that of BaAl2O4.The afterglow decay measuring showed that the phosphors of SrAl2O4 crystal structure have the more superior afterglow performance than that of BaAl2O4." @default.
- W2383213223 created "2016-06-24" @default.
- W2383213223 creator A5041873808 @default.
- W2383213223 date "2009-01-01" @default.
- W2383213223 modified "2023-09-27" @default.
- W2383213223 title "Preparation and Luminescence Properties of Sr_(1-x)Ba_xAl_2O_4∶Eu~(2+),Dy~(3+)" @default.
- W2383213223 hasPublicationYear "2009" @default.
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