【摘要】 通过高温固相法合成了Dy3+,Tm3+单掺杂的四硼酸锌(ZnB4O7)磷光体,测定了室温下这2个磷光体经60Coγ-射线辐照后的三维热释光谱。从三维热释光谱可以观察到:这2个磷光体的主发光峰均位于218℃;ZnB4O7∶Tm3+磷光体的主热释光峰的发射波长为366、453、475、651和754 nm,ZnB4O7∶Dy3+磷光体的主热释光峰的发射波长为480、573、665和755 nm,分别为稀土离子Tm3+和Dy3+的特征跃迁发射。对于Tm3+掺杂的ZnB4O7磷光体,热释光发射强度较高,在辐射剂量学领域有潜在的应用。利用峰形法,评估了ZnB4O7∶Tm3+磷光体在218℃时发光峰的动力学参数,其陷阱深度E为1.64 eV,频率因子为3.42×1016s-1,遵循二级动力学。更多还原

【Abstract】 Dy3 +or Tm3 +doped zinc tetraborate( ZnB4O7) phosphors were prepared by the method of high temperature solid-state synthesis. The 3-dimensional thermoluminescent( TL) spectra of the phosphors after60Co γ-ray radiation were measured at room temperature. The 3-dimensional TL spectra show that the main TL glow peaks of these phosphors appear at about 218 ℃. 3-Dimensional emission spectra of main TL peaks for the ZnB4O7∶ Tm3 +phosphor are at 366,453,475,651 and 754 nm,while TL peaks for the ZnB4O7∶ Dy3 +phosphor are at 480,573,665 and 755 nm,respectively. The formation of all peaks is ascribed to the characteristic rare earth ion transitions of Tm3 +and Dy3 +. The ZnB4O7∶ Tm3 +phosphor exhibits a higher TL emission efficiency,indicating its latent applicability in the field of radiation dosimetry compared with the ZnB4O7∶ Dy3 +phosphor. The kinetics parameters of the main TL peak of the ZnB4O7∶ Tm3 +phosphor at 218 ℃were investigated by using the peak shape method. This peak shows the second-order kinetics while the trap depth( E) and the frequency factor are evaluated as 1. 64 eV and 3. 42 × 1016s- 1,respectively.更多还原