One- and Two-Photon Excited Fluorescence of CdSe and CdSe/ZnS Quantum Dots in n-Hexane  

作　　者：郝中华 龚红梅 韩俊波 翟月英 王取泉 

机构地区：[1]Department of Physics, Wuhan University, Wuhan 430072 [2]Key Laboratory of Acoustic and Optic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072

出　　处：《Chinese Physics Letters》2006年第10期2859-2862,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grants Nos 10534030 and 10474075.The authors thank J. Peng for providing the QDs

摘　　要：One- and two-photon absorption and excited fluorescence of the CdSe and the core-shell structure CdSe/ZnS quantum dots （QDs） in n-hexane is investigated. The linear and nonlinear absorption coefficients are measured and the two-photon-absorption cross sections of the QDs are also obtained. For both one-photon fluorescence and two-photon fluorescence, the emission efficiency of CdSe/ZnS is much higher than that of CdSe, originating from the effective surface passivation of the core-shell structure.One- and two-photon absorption and excited fluorescence of the CdSe and the core-shell structure CdSe/ZnS quantum dots （QDs） in n-hexane is investigated. The linear and nonlinear absorption coefficients are measured and the two-photon-absorption cross sections of the QDs are also obtained. For both one-photon fluorescence and two-photon fluorescence, the emission efficiency of CdSe/ZnS is much higher than that of CdSe, originating from the effective surface passivation of the core-shell structure.

关 键 词：NANOCRYSTALS SPECTROSCOPY ABSORPTION ZNS EXCITATION GROWTH 

分 类 号：O43[机械工程—光学工程]