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	Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals (EI CONFERENCE)
	An L. M. ; Sun P. N. ; Liu L. ; Feng X. ; Kong L. P. ; Bi H. N. ; Yu B. ; Kong X. G. ; Liu Y. C.
	2006
会议名称	ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005
会议地点	Changchun, China
关键词	Thiol-capped CdSe/CdS core/shell nanocrystals (NCs) which show high luminescence quantum yield are synthesized in an aqueous solution. UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy are employed to analyze optical characters and stabilities of NCs. Furthermore PL properties are studied in a temperature range between 77K and 300K. The PL peak position of bare CdSe NCs shifts toward shorter wavelengths and the band becomes sharper with decreasing temperature. On the same condition the PL peak position of CdSe/CdS core/shell NCs keeps unconverted nearly with the variation of temperature. Photostability of bare CdSe NCs and CdSe/CdS core/shell NCs are compared under the 325nm laser irradiation. It takes 78 seconds that the PL intensity declines to the half for CdSe NCs but 442 seconds for CdSe/CdS core/shell NCs. The fluorescence decay lifetime increases about six times after overcoating. The results indicate that the CdS shell can improve the low temperature PL stability and photostability of CdSe NCs effectively.
收录类别	EI
内容类型	会议论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/33656]
专题	长春光学精密机械与物理研究所_中科院长春光机所知识产出_会议论文
推荐引用方式 GB/T 7714	An L. M.,Sun P. N.,Liu L.,et al. Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals (EI CONFERENCE)[C]. 见:ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005. Changchun, China.

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