稀土掺杂铝酸锶长余辉材料陷阱类型及发光机理

Defect Type and Phosphorescence Mechanism of Long Afterglow Phosphor Strontium Aluminate Dopped with Lanthanide

采用高温固相法制备了Sr3-x-y(Al1-zBz)2O6∶Eux2+,Dyy3+(x,y,z=0,0.1)长余辉发光粉。利用XRD测试仪、荧光分光光度计和热释光计量仪分别研究了Eu、Dy和B的掺杂对材料晶体结构、激发和发射光谱、余辉衰减特性和热释光光谱的影响。结果表明,Eu、Dy共掺杂的样品中Dy3+的掺杂有利于Eu3+还原为Eu2+。余辉曲线的拟合结果表明,Eu、Dy、B共掺的样品具有最好的余辉特性,这源于该样品具有最大的发光强度常数和时间衰减常数。Eu、Dy、B共掺样品的热释光曲线很好的由8个高斯峰拟合,分析了掺杂引入的缺陷类型及对应的热释光峰位,改进了长余辉发光材料电子转移发光模型。

The long afterglow luminescent materials Sr3-x-y（Al1-zBz）2O6： Eux^2 ＋,Dyy^3 ＋（x,y,z = 0,0. 1） were synthesized via solid-state reaction. X-ray diffraction,fluorescence spectrophotometer and thermal luminescent（TSL） spectroscope were employed to characterize the phosphors. The effects of Eu,Dy and（or） B doping on crystal structure,excitation and emission spectra,decay curves and thermoluminescence spectra of the phosphors were discussed. The results show that Dy^3 ＋doping is advantageous to the reduction of Eu^3 ＋to Eu^2 ＋in the codoped Eu and Dy sample. The simulated results of the decay curves show that the Eu,Dy and B codoped sample is provided with the biggest phosphorescence intensity constants and decay time constants,which generate the best persistent luminescence property. The TSL curve of the Eu,Dy and B codoped sample is well simulated with 8 Gaussian peaks. The defect types and corresponding TSL peaks resulted from doping were analysed,and electron transfermodel of phosphorescence mechanism was improved.