放射发光
余辉
光释光
热释光
发光
剂量计
材料科学
辐照
光电子学
分析化学(期刊)
放射化学
光学
辐射
化学
闪烁体
物理
天文
伽马射线暴
核物理学
探测器
色谱法
作者
J.J. Schuyt,G. V. M. Williams
摘要
Luminescence measurements of CsCdF3:Mn reveal material properties suitable for UV and X-ray sensing. Mn2+ substitutes for Cd2+ with octahedral crystal field parameters 10Dq = 7020 ± 120 cm−1 and B = 773 ± 13 cm−1. UV stimulation at 250 nm results in intense Mn2+ emission and also in the production of F-centers and additional defects. Continuous 250 nm stimulation charges the material, enhancing the Mn2+ emission intensity over time due to the filling of shallow traps that contribute to persistent luminescence. When the stimulation is ceased, Mn2+ emission is observed as an afterglow. F-centers give rise to optically stimulated luminescence (OSL) that is temporally stable and can be stimulated at wavelengths near 300 nm. We propose a model that describes these effects, where UV stimulation results in electron transfer from Mn2+ to the conduction band and subsequent electron trapping in various defect states. X-ray stimulation produces Mn2+ radioluminescence that varies in intensity by 0.004%/Gy after a 300 Gy priming dose. The X-ray irradiation also produces OSL-active F-centers and the defects that cause the afterglow. Thermoluminescence measurements reveal low-temperature peaks that are correlated with the afterglow and high-temperature peaks that are correlated with the OSL, after both X-ray and UV irradiations. The luminescence of Mn2+ in CsCdF3:Mn may be useful for radiation sensing, where the real-time changes in Mn2+ emission under X-ray and UV stimulation allow for real-time dose measurements, and the OSL induced by each irradiation allows for retrospective dose monitoring.
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