Single-Nanocrystal Spectroscopy of White-Light-Emitting CdSe Nanocrystals

被引：43
作者：
Dukes, Albert D., III [1 ]
Samson, Philip C. [2 ,4 ]
Keene, Joseph D. [1 ,3 ]
Davis, Lloyd M. [2 ]
Wikswo, John P. [2 ,4 ,7 ,8 ,9 ]
Rosenthal, Sandra J. [1 ,2 ,4 ,5 ,6 ,9 ,10 ]
机构：
[1] Vanderbilt Univ, Dept Chem, Nashville, TN 37235 USA
[2] Vanderbilt Univ, Vanderbilt Inst Integrat Biosyst Res & Educ, Nashville, TN 37235 USA
[3] Univ Tennessee, Inst Space, Ctr Laser Applicat, Tullahoma, TN 37388 USA
[4] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA
[5] Vanderbilt Univ, Dept Pharmacol, Nashville, TN 37235 USA
[6] Vanderbilt Univ, Dept Chem & Biomol Engn, Nashville, TN 37235 USA
[7] Vanderbilt Univ, Dept Biomed Engn, Nashville, TN 37235 USA
[8] Vanderbilt Univ, Dept Mol Physiol & Biophys, Nashville, TN 37235 USA
[9] Vanderbilt Univ, Vanderbilt Inst Nanoscale Sci & Engn, Nashville, TN 37235 USA
[10] Oak Ridge Natl Lab, Joint Fac Oak Ridge Natl Lab, Oak Ridge, TN USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY A | 2011年 / 115卷 / 16期
基金：
美国国家科学基金会;
关键词：
CADMIUM SELENIDE NANOCRYSTALS; SEMICONDUCTOR QUANTUM DOTS; FLUORESCENCE INTERMITTENCY; EMISSION; GROWTH;
D O I：
10.1021/jp1109509
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report the observation of broad-spectrum fluorescence from single CdSe nanocrystals. Individual semiconductor nanocrystals typically have a narrower emission spectrum than that of an ensemble. However, our experiments show that the ensemble white-light emission observed in ultrasmall CdSe nanocrystals is the result of many single CdSe nanocrystals, each emitting over the entire visible spectrum. These results indicate that each white-light-emitting CdSe nanocrystal contains all the trap states that give rise to the observed white-light emission.
引用
收藏
页码：4076 / 4081
页数：6
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