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Fabrication of Gd2O2S:Tb scintillation ceramics from the uniformly doped nanopowder
Optical Materials ( IF 3.8 ) Pub Date : 2021-05-21 , DOI: 10.1016/j.optmat.2021.111192
Xinyou Huang , Jiyang Ding , Xin Liu , Xiaoying Li , Haohong Chen , Dianju Hu , Danyang Zhu , Tengfei Xie , Jianrong Zhou , Xingfen Jiang , Zhijia Sun , Jiang Li

Single-phase 2Gd2O3·(Gd,Tb)2(SO4)3·nH2O precursor with strong crystallinity was synthesized by the water-bath method through optimizing the introducing method of Tb3+ doping, where Tb3+ was introduced from Tb(NO3)3. The formation process and phase evolution of the precursor were analyzed in detail. Compared with the conventional method of introducing Tb3+ via Tb4O7, the inhomogeneous doping caused by the appearance of 2Tb2O3·(Gd,Tb)2(SO4)3·nH2O in the precursor was avoided. Pure Gd2O2S:Tb nanopowders with layered structure were obtained after calcination in flowing H2-Ar. The Gd2O2S:Tb powder prepared with Tb(NO3)3 has higher XEL intensity than that with Tb4O7. Using the synthesized powders as starting material, Gd2O2S:Tb scintillation ceramics with high relative density (over 99% of the theoretical value) were fabricated by vacuum pre-sintering and HIP post-treatment in an argon atmosphere. The influences of the introducing method of Tb3+ doping on the microstructure, photoluminescence and X-ray excited luminescence of the Gd2O2S:Tb ceramics were studied. The ceramic sample prepared with Tb(NO3)3 has better luminescence properties due to the homogeneous doping in the ceramics. Temperature-dependent XEL measurements imply that the green emission of the ceramic sample is always dominant with the increase of temperature from 77 K to 340 K, attributed to the cross-relaxation between 5D3 and 5D4 levels of Tb3+.



中文翻译:

用均匀掺杂的纳米粉制备Gd 2 O 2 S:Tb闪烁陶瓷

单相2GD 2 ö 3 ·(钆,铽)2(SO 43 ·nH的2 ö前体与结晶强通过优化Tb的导入方法通过水浴方法合成3+掺杂,其中TB 3+由Tb(NO 33引入。详细分析了前驱体的形成过程和相演化。与传统的通过Tb 4 O 7引入Tb 3+的方法相比,由2Tb 2 O 3 ·(Gd,Tb)2的出现引起的不均匀掺杂。(SO 43 ·nH的2被避免○在所述前体。在流动的H 2 -Ar中煅烧后,得到具有分层结构的纯Gd 2 O 2 S:Tb纳米粉。用Tb(NO 33制备的Gd 2 O 2 S:Tb粉末的XEL强度高于用Tb 4 O 7的粉末。以合成粉末为原料,Gd 2 O 2通过在氩气氛中进行真空预烧结和HIP后处理,制造出具有较高相对密度(超过理论值的99%)的S:Tb闪烁陶瓷。研究了Tb 3+掺杂的引入方法对Gd 2 O 2 S:Tb陶瓷的微观结构,光致发光和X射线激发发光的影响。由于陶瓷中的均匀掺杂,用Tb(NO 33制备的陶瓷样品具有更好的发光性能。取决于温度的XEL测量结果表明,随着温度从77 K升高到340 K,陶瓷样品的绿色发射始终占主导地位,这归因于5 D之间的交叉松弛Tb 3+的35 D 4含量。

更新日期:2021-05-22
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