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	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：17/0 \| 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.
	TeO2-ZnO-Na2O-K2O玻璃中Er^3＋离子掺杂浓度对其发光及荧光寿命的影响期刊论文 OAI收割物理学报, 2005, 卷号: 54, 期号: 7, 页码: 3418, 3423 陈炳炎; 刘粤惠; 陈东丹; 姜中宏收藏 \| 浏览/下载：1253/308 \| 提交时间：2009/09/24 Er^3+离子 TeO2-ZnO-Na2O-K2O glasses 掺杂浓度 Er3+ ions 荧光寿命 concentration doped 碲酸盐玻璃 luminescence and fluorescence lifetime 吸收光谱发射光谱发射截面发光强度荧光强度猝灭效应强度降低实验确定浓度猝灭最优值