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利用活化Al-Sr合金粉末水解产物作为制备SrAl2O4长余辉材料的前驱体,并采用高温固相反应法制备出Sr1-xAl2O4∶Eu0.01,Dyx长余辉材料,并研究Dy掺杂量分别为x=0,0.01,0.02,0.03(%,原子分数)的长余辉材料荧光性能及长余辉特性。实验结果表明,随着Dy掺杂量的增大,长余辉材料初始发光亮度和余辉时间都随之增大。缺陷化学分析结果认为,所掺杂的稀土离子取代SrAl2O4晶格中的Sr2+离子格位,产生缺陷EuSr×,EuS.r和DyS.r,EuSr×为荧光发射中心,其浓度大小决定了长余辉初始发光亮度;EuS.r和DyS.r为带正电荷的缺陷,为满足体系电中性平衡,其周围吸引了带负电荷的缺陷,形成陷阱,可捕获带正电的空穴。其浓度大小,能级深浅将控制余辉时间。
Sr1-xAl2O4:Eu0.01, Dyx long afterglow materials were prepared by using the hydrolyzed product of activated Al-Sr alloy powder as precursors for the preparation of SrAl2O4 long afterglow material. The doping amounts of Dy were determined to be x = 0,0.01,0.02,0.03 (%, atomic fraction) long afterglow material fluorescence properties and long afterglow characteristics. The experimental results show that with the increase of Dy doping, the initial luminescence intensity and afterglow time of long afterglow material both increase. Defect chemical analysis shows that the substituted rare earth ions replace the Sr2 + ion lattice in SrAl2O4 lattice to produce defects EuSr ×, EuSr and DyS.r, EuSr × is the center of fluorescence emission, and its concentration determines the long afterglow Initial luminescence brightness; EuS.r and DyS.r are positively charged defects, in order to meet the system neutral charge balance, attract negative charges around the defect, the formation of traps, can capture positively charged holes. The concentration level, energy level will control the afterglow time.