稀土Dy3+，Tm3+单掺杂的ZnB4O7磷光体的热释光

doi:10.3724/SP.J.1095.2014.30461

摘要/Abstract

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60Co γ-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3.42×1016 s-1，遵循二级动力学。

关键词: 高温固相法, 四硼酸锌, 稀土, 热释光

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 after 60Co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 3.42×1016 s-1, respectively.

Key words: solid-state reaction, zinc tetraborate, rare earth, thermoluminescence

中图分类号:

O482.3

刘丽艳, 孙一丹, 于湛, 田鹏, 张向东, 姜丽宏, 李成宇. 稀土Dy³⁺，Tm³⁺单掺杂的ZnB₄O₇磷光体的热释光[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30461.

LIU Liyan1*, SUN Yidan1, YU Zhan1, TIAN Peng1, ZHANG Xiangdong2, JIANG Lihong3, LI Chengyu3. Thermoluminescence of Rare Earth Ion Dy³⁺/Tm³⁺ Doped Zinc Tetraborate Phosphors[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30461.

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稀土Dy³⁺，Tm³⁺单掺杂的ZnB₄O₇磷光体的热释光

Thermoluminescence of Rare Earth Ion Dy³⁺/Tm³⁺ Doped Zinc Tetraborate Phosphors

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