B2O3对SrAl2O4:Eu2+,Dy3+材料热释光谱和长余辉性能的影响

采用高温固相合成法制备了黄绿色SrAl2O4：Eu^2＋,Dy^3＋长余辉发光材料,其激发光谱峰值为345nm和405nm,发射光谱峰值为520nm.不同B2O3含量样品的扫描电镜照片表明：随着助熔剂硼酸掺入量的增加,晶体的结晶度越来越高;其X射线衍射分析表明：随着硼酸掺入量的增加,属单斜晶系的SrAl2O4晶体结构仍是材料的主相,但是有新的铝酸盐生成.从测得的相应的热释光曲线分析：硼酸掺入量为17mol%的样品具有最大的陷阱能级0.59eV,对应于329K的热释光峰,这一陷阱分布使材料的余辉性能得到了很大的提高.用一般阶动力学模型对热释光曲线进行拟合,得出了它的陷阱参数.

Influence of boracic acid on traps distribution and afterglow properties of SrAl2O4:Eu2+,Dy3+phosphor materials

Blue-purple long afterglow phosphors SrAl2O4:Eu2 ,Dy3 were synthesized by conventional solid phase reaction method. There are two excitation peaks at 345nm and 405nm, and a emission peak at 520nm. The scanning electron microscopy (SEM) images indicate the crystallinity of phosphors is enhanced greatly with the increase of H3BO3 concentration.Determined by X-ray power diffraction(XRD), SrAl2O4 belong to monolicnic system remains the main phase of the phosphors,while the new aluminate is observed .From analyzing the thermoluminescence curves, when the mole ratios of H3BO3 in SrAl2O4 is 17%, the most powerful trap is 0.59eV corresponding to peak at 329K, which improves the afterglow properties of phosphor.The trapped depths are acquired by fitting the experimental results with general order kinetic model.