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By adjusting the proportion of components, fluorescence crystal structure, luminescent properties and long afterglow characteristics of SrAl2xO3x+1: Eu2+, Dy3+(x=1~2) were studyied. Strontium nitrate and aluminum nitrate as a matrix of raw materials, then ammonia and aluminum fluoride boric acid as a cosolvent, we used cationic oxalate coprecipitation, wet mixing, synthesis method and step-by-step method to prepare a series of long afterglow luminescent materials with high-brightness, long afterglow and good size distribution. Based on X-ray diffraction pattern of sample, excitement and emission spectra and afterglow decay curve measurement, we found that SrAl2xO3x +1: Eu2+, Dy3+ has a good crystalline state. With x increasing, AES peak moved from 520nm to 470nm; afterglow time for attenuation to recognizable luminous intensity of 0.32mcd/m2 can be extended from 30h to 60h. The characteristics of different afterglow are mainly due to Eu2+ in matrix with different concentrations, different decay rate of blue and green radiation centers. The blue light-emitting center was significantly higher than the green one.
Retirement
6Â¥2009-08-24 11:08:11
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By adjusting the matrix component proportion£¬research the phosphor crystal structure of SrAl2xO3x+1:Eu2+,Dy3+£¨x=1~2£©, luminance and persistence characteristic.Select strontium nitrate and aluminium nitrate as stroma materials, use AmmoniumBorate and aluminium fluoride as latent solvent, synthesis series of long-lasting phosphor by the stepwise synthesis and  co-precipitates of oxalates ,wet-mixing. the long-lasting phosphor in the paper having the qualities of High brightness,long afterglow, Good particle size distribution.
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3Â¥2009-08-23 13:15:42
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The Xs and emission spectrum results showed that SrAl2xO3x+1: Eu2+,Dy3+ have good crystallizationcan , with the x increasing he excited from 520nm to 470nm.
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