CdS-ZnSe和CdSe-ZnS量子点的合成和Frster能量转移研究(英文)  

Synthesis and Frster Resonant Energy Transfer(FRET) Study of Quantum Dots Assembly

作　　者：弓亚琼[1] 詹寰 张贺楠 卫增岩 苏伟 

机构地区：[1]中北大学化工与环境学院,太原030051 [2]Department of Chemistry, City College of the City University of New York, New York, 10031, USA [3]Department of Chemistry, Hunter College of the City University of New York, New York, 10065, USA

出　　处：《无机化学学报》2013年第2期389-396,共8页Chinese Journal of Inorganic Chemistry

基　　金：山西省青年科技研究基金(No.2012021005-2)资助项目

摘　　要：采用分步合成法成功合成了CdS-ZnSe(Ⅰ型)和CdSe-ZnS(Ⅱ型)核-壳结构量子点。并首次构建了CdS-ZnSe/CdSe-ZnS结构F觟rster能量转移对。利用吸收光谱(UV-Vis),光致发光谱(PL),时间分辨光致发光谱(TRPL),透射电子显微镜(TEM)对比研究了不同配比的CdS-ZnSe/CdSe-ZnS结构Förster能量转移。分析结果表明:在能量转移发生时,CdS-ZnSe荧光强度显著下降,荧光寿命明显缩短,Frster能量转移确实存在于CdS-ZnSe/CdSe-ZnS量子点之间。One Forster resonant energy transfer （FRET） donor-acceptor assembly was built from quantum dots （QDs） of type ] CdSe-ZnS （QD491） and type II CdS-ZnSe （QD560） QDs. The assembly was further characterized by steady-state and time-resolved photoluminescence （TRPL） measurements at different donor-to- acceptor ratios. Both photoluminescence quenching and reduction of the exciton lifetime of donor QDs provide concrete evidence of FRET between the type I QDs and the type 11 QDs. Because the emission wavelengths of CdS-ZnSe and CdSe-ZnS QDs can be spectrally separated by tuning the size of these QDs, the binary QD assembly of type I -type Ⅱ QDs could be an attractive approach for the development of efficient light emitters and bio-sensors.

关 键 词：FRET 量子点 荧光 时间分辨光致发光谱 

分 类 号：O644.17[理学—物理化学]