EFFECT OF PR-CODOPING ON THE X-RAY-INDUCED AFTERGLOW OF (Y,GD)(2)O-3-EU

被引：55

作者：

KOSTLER, W ^{[1
]}

WINNACKER, A ^{[1
]}

ROSSNER, W ^{[1
]}

GRABMAIER, BC ^{[1
]}

机构：

[1] UNIV ERLANGEN NURNBERG,D-91058 ERLANGEN,GERMANY

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1995年 / 56卷 / 07期

关键词：

OXIDES; DEFECTS; LUMINESCENCE; OPTICAL PROPERTIES;

D O I：

10.1016/0022-3697(95)00023-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The afterglow properties of (Y,Gd)(2)O-3: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)(2)O-3: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)(2)O-3: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.

引用

页码：907 / 913

页数：7

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