正交设计法优化红色长余辉发光材料Sr_3Al_2O_6:Eu^(2+),Dy^(3+)的制备工艺

Optimization of Preparation Technology of Sr_3Al_2O_6:Eu^(2+),Dy^(3+) by Using Orthogonal Design Method

采用溶胶凝胶法制备出Sr3Al2O6:Eu2+,Dy3+红色余辉发光材料.利用X射线衍射仪对材料的物相进行了分析,应用荧光分光光度计、照度计测定了样品的发光特性.通过正交试验,以初始亮度和余辉时间为指标,研究了煅烧温度、Eu含量、Dy含量、B含量对制备工艺的影响.结果表明:各个因素在实验设计水平范围内变化时,制得的样品晶相相同,均为Sr3Al2O6;最佳制备工艺中煅烧温度为1 150℃,当xEu2+=0.03,yDy3+=0.01,zB2+=0.2时,样品的激发峰为473 nm,发射峰为612 nm,对应于Eu2+离子4f和5d间的激发和发射.

The Sr3Al2O6：Eu^2＋,Dy^3＋ red-emitting phosphors were prepared by sol-gel method. The crystal structure were characterized by X-ray diffraction （XRD）. The excitation, emission and afterglow spectra were investigated by fluorescence spectrophotometer techniques. In order to study the optimal p reparation technology of Sr3Al2O6：Eu^2＋,Dy^3＋ phosphor, the synthesis conditions are optimized by using orthogonal design method. With initial brightness and afterglow time as indexes, the effects of calcining temperature, Eu, Dy, and B are discussed. The results of XRD analysis show that the main phase is Sr3Al2O6. The excitation peak of Sr3Al2O6：Eu^2＋,Dy^3＋ phosphor is at 473 nm, and the emission spectra with peak at 612 nm attributed 4i65d^1→4f^7 of divalent europium. The results indicated that the optimal preparation technology is as follows： calcine temperature is 1 150 ℃, XEu^2＋ =0.03,YDy^3＋ =0.01,ZB^2＋ =0.2.