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

页码：455 / 458

页数：4

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