Sensitization of the photostimulable x-ray storage-phosphor CsBr:Eu2+ following room-temperature hydration
Sensitization of the photostimulable x-ray storage-phosphor CsBr:Eu2+ following room-temperature hydration
复制标题
室温水合后光激发 X 射线存储磷光体 CsBr:Eu2 的敏化
DOI：
10.1063/1.3103318
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发表时间：
2009
影响因子：
3.2
通讯作者：
H. Seggern
中科院分区：
文献类型：
--
作者：
G. Appleby;J. Zimmermann;S. Hesse;O. Karg;H. Seggern
研究发现，X射线存储荧光粉CsBr：Eu 2+在室温下水合后，光激励发光（PSL）强度大幅增加。在暴露于99%相对湿度的气氛中60分钟后，灵敏度增加了25倍，这被认为是由于CsBr：Eu 2+基质中掺入了H2O分子，这些分子通过（Eu 2 +-O2−）-偶极子周围的电场定向并增强了电场，从而增加了它们的电荷捕获截面。照射后的PSL增加伴随着形成的移动的VK-中心，这减少了F-中心人口的重组过程中，出现作为一个固有的360 nm发射从CsBr矩阵在低温热释光测量。
The x-ray storage-phosphor CsBr:Eu2+ has been found to exhibit a strong increase in photostimulated-luminescence (PSL) intensity following hydration at room temperature. The sensitivity increases by a factor of 25 following a 60 min exposure to an atmosphere of 99% relative humidity, which is considered to be due to an incorporation of H2O molecules within the CsBr:Eu2+ matrix, which are orientated by and enhance the electric fields surrounding (Eu2+–O2−)-dipoles, increasing their charge trapping cross sections. Following irradiation the PSL increase is accompanied by the formation of mobile VK-centers, which decrease the F-center population by a recombination process, which appear as an intrinsic 360 nm emission from the CsBr matrix in low temperature thermoluminescence measurements.