中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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Phase Separation in Poly(9,9-dioctylfluoxene)/Poly(methyl methacrylate) Blends 期刊论文  OAI收割
macromolecular chemistry and physics, 2010, 卷号: 211, 期号: 3, 页码: 313-320
Zhao K; Zhou G; Wang Q; Han YC; Wang LX; Ma DG
收藏  |  浏览/下载:22/0  |  提交时间:2012/06/07
Novel properties of photochromic spirooxazine nanoparticles 期刊论文  OAI收割
CHINESE JOURNAL OF CHEMISTRY, 2007, 卷号: 25, 期号: 11, 页码: 1612-1616
作者:  
Liu Yuan-Yuan;  Fan Mei-Gong;  Zhang Chang-Rui;  Sheng Xiao-Hai;  Yao Jian-Nian
  |  收藏  |  浏览/下载:41/0  |  提交时间:2019/04/09
Novel properties of photochromic spirooxazine nanoparticles 期刊论文  iSwitch采集
Chinese journal of chemistry, 2007, 卷号: 25, 期号: 11, 页码: 1612-1616
作者:  
Liu Yuan-Yuan;  Fan Mei-Gong;  Zhang Chang-Rui;  Sheng Xiao-Hai;  Yao Jian-Nian
收藏  |  浏览/下载:59/0  |  提交时间:2019/05/10
Optical characterization of bare CdSe and CdSe/CdS core/shell nanocrystals (EI CONFERENCE) 会议论文  OAI收割
ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Liu L.;  Yu B.;  Liu L.
收藏  |  浏览/下载:21/0  |  提交时间:2013/03/25
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.  
Energy transfer and red phosphorescence in strontium aluminates doped with Cr3+, Eu2+ and Dy3+ (EI CONFERENCE) 会议论文  OAI收割
Dielectrics in Emerging Technologies -and- Persistent Phosphors - International Symposia, May 15, 2005 - May 20, 2005, Quebec City, QC, Canada
作者:  
Wang X.;  Wang X.;  Wang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载:34/0  |  提交时间:2013/03/25
Cr3+ activated red (694 nm) long persistent phosphorescence originating from 2E-4A2 transition is observed in 4SrO·7Al2O3: Cr3+  Eu2+  Dy3+ system. It is demonstrated that the red phosphorescence is resulted from the conversion of Eu2+ activated blue phosphorescence through persistence energy transfer from Eu2+ to Cr3+. The excitation spectra of the 694 nm emission exhibit strong f-d band of Eu 2+  indicating the existence of the energy transfer. The dependence of lifetimes and intensities of the red and blue emissions on Cr3+ concentrations are studied. The intensity ratio of the red to blue emission bands obtained from photoluminescence spectra is in good agreement with that obtained from fluorescence lifetime measurements. The decay curves of the red phosphorescence at 694nm are also studied.