Citation:
LIU Liyan, SUN Yidan, YU Zhan, TIAN Peng, ZHANG Xiangdong, JIANG Lihong, LI Chengyu. Thermoluminescence of Rare Earth Ion Dy3+/Tm3+ Doped Zinc Tetraborate Phosphors[J]. Chinese Journal of Applied Chemistry,
;2014, 31(7): 835-840.
doi:
10.3724/SP.J.1095.2014.30461
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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.
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Keywords:
- solid-state reaction,
- zinc tetraborate,
- rare earth,
- thermoluminescence
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