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采用γ射线对SrAl_2O_4…Eu~(2+),Dy~(3+)长余辉荧光材料进行辐照处理,研究样品经辐照后的长余辉性能。用60 Co~γ射线源照射固相合成的SrAl_2O_4…Eu~(2+),Dy~(3+)长余辉荧光材料样品,累积辐照剂量为100kGy。利用X射线衍射仪(XRD)、拉曼光谱仪、紫外可见分光光度计、荧光分光光度计及热释光(TL)光谱仪对辐照前后样品的晶体结构、光吸收特性、余辉及热释光特性进行了研究。结果表明:辐照后样品的晶胞体积减小,氧空位的浓度增加;由于辐照使样品中引入更多的缺陷,其吸收光谱的强度提高。辐照后样品的余辉寿命延长,余辉光谱强度增加;热释光强度增加,且光谱向高温方向偏移,经计算得到辐照后样品中陷阱能级深度增加0.0039eV,表明辐照影响了样品中陷阱能级分布且增加了样品中的深能级陷阱数目。
The long afterglow properties of SrAl_2O_4 ... Eu ~ (2 +) and Dy ~ (3 +) long afterglow phosphors were irradiated by γ-rays. The 60Co ~ γ ray source was used to irradiate the solid phase synthesized SrAl_2O_4 ... Eu ~ (2 +) and Dy ~ (3 +) long afterglow fluorescent materials with a cumulative irradiation dose of 100kGy. The crystal structure, optical absorption properties, afterglow and thermoluminescence properties of samples before and after irradiation were characterized by X-ray diffraction (XRD), Raman spectroscopy, UV-visible spectrophotometer, fluorescence spectrophotometer and TL spectrometer Were studied. The results showed that the unit cell volume and the oxygen vacancy concentration of irradiated samples decreased after irradiation. The intensity of absorption spectra increased due to the introduction of more defects in the samples. After irradiation, the afterglow lifetime of the samples was extended and the intensity of the afterglow spectrum was increased. The intensity of the thermoluminescence increased and the spectrum was shifted to the high temperature. The depth of the trap level in the sample after irradiation was increased by 0.0039eV, indicating that irradiation affected the sample The trap levels are distributed and the number of deep level traps in the sample is increased.