Radiation-induced changes in the optical properties of NaMgF3(Sm): Observation of resettable Sm radio-photoluminescence

被引：25
作者：
Schuyt, J. J. [1 ]
Williams, G. V. M. [1 ]
机构：
[1] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, SCPS, POB 600, Wellington 6140, New Zealand
来源：
MATERIALS RESEARCH BULLETIN | 2018年 / 106卷
关键词：
Fluorides; Optical properties; Luminescence; Radiation damage; Defects; STIMULATED LUMINESCENCE; THERMOLUMINESCENCE; RADIOLUMINESCENCE; IRRADIATION; OSL;
D O I：
10.1016/j.materresbull.2018.06.039
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stable radio-photoluminescence (RPL) is observed in NaMgF3(Sm) after X-ray irradiation due to valence conversion of Sm3+ to Sm2+. This valence conversion can be reversed by deep UV (254 nm) illumination. It is likely that this reversible process occurs via defects near some of the Sm3+ sites that act as hole traps. The ratio of the Sm2+/Sm3+ RPL emissions follows an exponential-type curve dependence on X-ray dose where the ratio saturates above similar to 500 Gy. Optically stimulated luminescence (OSL) is also observed but only from Sm3+ and primarily from electrons trapped at F-centers. The OSL response is demonstrated to be linear up to 100 Gy. Thus, NaMgF3(Sm) has potential as a dosimeter where individual irradiations can be monitored via OSL and the total cumulative dose via non-destructive RPL readout. The RPL can be optically reset when required.
引用
收藏
页码：455 / 458
页数：4
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