Effect of Pr-codoping on the X-ray induced afterglow of (Y,Gd)2O3:Eu
Effect of Pr-codoping on the X-ray induced afterglow of (Y,Gd)2O3:Eu
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DOI：
10.1016/0022-3697(95)00023-2
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发表时间：
1995-07
影响因子：
4
通讯作者：
W. Köstler;A. Winnacker;W. Rossner;B. C. Grabmaier
中科院分区：
文献类型：
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作者：
W. Köstler;A. Winnacker;W. Rossner;B. C. Grabmaier
研究了(Y,Gd)2O3:Eu陶瓷的余辉性能以及X射线辐照形成的相关缺陷。将温度相关的余辉测量与热释光曲线进行了比较，发现 (Y,Gd)2O3:Eu 的余辉是由热不稳定的俘获电荷载流子引起的。 Pr 的共掺杂导致余辉的强烈减少。在 X 射线照射过程中会形成 Pr4+，通过比较 X 射线照射和氧化样品的吸收光谱可以识别出 Pr4+。 (Y,Gd)2O3:Eu,Pr 的热致发光测量表明，Pr3+ 作为有效的空穴陷阱，成功地与本征空穴陷阱竞争，并且在高达 700 K 的温度下保持稳定。导致室温下高余辉的热不稳定本征空穴陷阱不再被占据，因此余辉大大减少。
The afterglow properties of (Y,Gd)2O3:Eu ceramics and related defects formed by X-ray irradiation have been investigated. Temperature-dependent afterglow measurements have been compared with thermoluminescence curves and it has been found that afterglow of (Y,Gd)2O3:Eu is caused by thermally unstable trapped charge carriers. Codoping of Pr results in a strong decrease of afterglow. During X-ray irradiation Pr4+is formed, which has been identified by comparing absorption spectra of X-ray irradiated and oxidized samples. Thermoluminescence measurements of (Y,Gd)2O3:Eu,Pr show that Pr3+acts as an effective hole trap which successfully competes with the intrinsic hole traps and is found to be stable up to 700 K. The thermally unstable intrinsic hole traps which are responsible for the high afterglow at room temperature are no longer occupied and therefore afterglow is drastically reduced.