Photo-bleaching effect in divalent samarium-doped alkaline-earth fluorohalides

	Photo-bleaching effect in divalent samarium-doped alkaline-earth fluorohalides
	Qin W. P.; Jang K. W.; Cho H.; Chung Y. W.; Park S.; Lee Y. I.; Kim C.
	2004
发表期刊	Journal of the Korean Physical Society
ISSN	0374-4884
卷号	45 期号:2 页码:512-517
摘要	When a CW laser was focused on a sample of divalent samarium-doped alkaline-earth fluorohalides (Mg0.5Sr0.5FCl0.5Br0.5 : Sm2+ or BaFCl0.5Br0.5 : Sm2+), the fluorescence intensity of Sm2+ ions decreased rapidly. Under irradiation from a 488-nm laser with a power density of 10 W/cm(2), the intensity of the D-5(0) --> F-7(0) (Sm2+) emission decreased as much as 96 % of its initial intensity in 30 minutes (for an X-ray-reduced sample). The so-called photo-bleaching effect can be influenced by the processes used for sample synthesis, such as the reduction method, the grinding process or X-ray irradiation. The decreasing curves obtained in the photo-bleaching experiments were fitted, a biexponential decreasing mode was found, which included a fast decrease (time constant similar to tens of seconds) and a slow decrease (time constant similar to hundreds of seconds). There was no evidence to support the divalent samarium ions being photo-ionized into trivalent samarium ions in the photobleaching process. The most probable mechanism for the photo-bleaching effect involves structural defects and color centers in the samples.
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/34541
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Qin W. P.,Jang K. W.,Cho H.,et al. Photo-bleaching effect in divalent samarium-doped alkaline-earth fluorohalides[J]. Journal of the Korean Physical Society,2004,45(2):512-517.
APA	Qin W. P..,Jang K. W..,Cho H..,Chung Y. W..,Park S..,...&Kim C..(2004).Photo-bleaching effect in divalent samarium-doped alkaline-earth fluorohalides.Journal of the Korean Physical Society,45(2),512-517.
MLA	Qin W. P.,et al."Photo-bleaching effect in divalent samarium-doped alkaline-earth fluorohalides".Journal of the Korean Physical Society 45.2(2004):512-517.

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