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Of spray pyrolysis preparation SrAl_2O_4 : Eu - (2) , Dy ~ ( 3 ) and its Characterization

Author: LiMin
Tutor: WangLinSheng
School: Jiangxi University of Technology
Course: Materials Science
Keywords: Spray pyrolysis SrAl2O4: Eu2, Dy3 Long Afterglow Luminescent materials
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Abstract


The rare earth ion activated alkaline earth aluminate phosphorescent material, especially in the course of development of europium, dysprosium, alkaline earth strontium aluminate activated long afterglow materials, current research, preparation methods and the luminescence mechanism. Synthesized by spray pyrolysis the spherical of SrAl 2 O 4 : the of Eu 2 , Dy 3 long afterglow materials research the different preparation conditions the pair of SrAl 2 O : the of Eu 2 the Dy 3 luminous material structure, morphology, particle size distribution, the afterglow performance and spectral performance impact, and are prepared with the high-temperature solid-phase method of SrAl 2 O 4 : of Eu < / sup>, the Dy 3 Long Afterglow material contrast. Experimental results show that: the long high-temperature solid phase prepared SrAl 2 O 4 : Eu 2 , Dy 3 Afterglow of SrAl 2 O 4 : Eu 2 , Dy 3 crystal structure with ɑ-of SrAl < sub> 2 O 4 phosphorus quartz crystal structure of the same doping of Eu, Dy has little effect on the crystal structure. Flux boric acid can not only reduce the synthesis temperature, but also enhance the performance of light-emitting materials afterglow. Amount of boric acid change of SrAl 2 O 4 : Eu 2 , the Dy 3 emission spectral peaks bit little. 2 O of SrAl 4 : the of Eu 2 system of light-emitting materials, the best auxiliary activator the Dy 3 the introduction of the the Dy 3 significantly enhance the performance of light-emitting materials afterglow, but does not change the shape and characteristics of the emission spectra peak when Eu 2 Dy 3 ratio of 0.01:0.02, the available afterglow properties of SrAl 2 O 4 : the of Eu 2 , Dy < sup> 3 long afterglow luminescent material. High temperature solid state prepared of SrAl 2 O 4 : the of Eu 2 , the reduction temperature of the Dy 3 in 1350 ℃ restore time 3h afterglow obtain better performance, long-lasting light-emitting material. Spray pyrolysis two sections were prepared the spherical of SrAl 2 O 4 : the of Eu 2 , the Dy 3 Afterglow of SrAl 2 O 4 : Eu 2 , Dy 3 crystal structure with ɑ-of SrAl < sub> 2 O 4 phosphorus quartz crystal structure of the same doping of Eu, Dy has little effect on the crystal structure. Precursor solution concentration, temperature and reduction temperature of pyrolysis product morphology, particle size distribution, the luminescent properties have a greater impact. With the reduction temperature increased, the product of the red-shifted emission peak position. Flux H 3 the BO1 3 , not only can reduce synthesis temperature, but also effectively improve the afterglow properties of the luminescent material may be, when the boric acid in an amount of 3.5mol% to form better of SrAl 2 O 4 crystals, and light-emitting materials with good afterglow performance and morphology. With the increase in the amount of boric acid, long afterglow luminescent material excitation spectrum of the \The use of additives can be significantly improved and the morphology of the modified material, and enhance the initial brightness of the material and prolong the afterglow time of the material (the use of citric acid will shorten the afterglow time of the material). Was added citric acid helps to get the solid spherical particles, ethanol in addition to good dispersion, but also effectively increases the sphericity of the particles, but not for solid particles, PEG can play the role of the dispersing agent and a stabilizer. When three additives used simultaneously to obtain high initial brightness, long afterglow time, good dispersibility, smaller particle size, narrow particle size distribution (from 2 μm to 5 μm) of the solid spherical particles. They are best added in an amount of: citric acid, 0.3g / L; PEG is 0.03mol / L; ethanol 40ml / L. Prepared by spray pyrolysis of SrAl 2 O 4 : the of Eu 2 , the Dy 3 Long Afterglow Luminescent Materials Compared prepared by high temperature solid low synthesis temperature, well dispersed, small particle size, narrow particle size distribution (of 2 μm to 5 μm) the morphology rules (solid spherical), high brightness, long afterglow time (gt; 65h ), etc..

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