Fluorescence quantum yield of CdSe/ZnS nanocrystals investigated by correlated atomic-force and single-particle fluorescence microscopy

被引：192

作者：

Ebenstein, Y

Mokari, T

Banin, U ^{[1
]}

机构：

[1] Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel

[2] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 21期

关键词：

D O I：

10.1063/1.1482785

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Correlated atomic-force and fluorescence microscopy are used to study single-particle versus ensemble fluorescence quantum yields (QY) of semiconductor nanocrystals by measuring a simultaneous map of the topography and the single-particle fluorescence. CdSe/ZnS nanocrystal quantum dots and quantum rods with high QY were investigated. A significant portion of dark particles is detected. Comparison with the ensemble solution QY shows that samples with higher QY have a larger fraction of bright particles accompanied by an increased single-particle QY. Saturated emission from single nanocrystals could not be detected because of particle darkening under high-power excitation. (C) 2002 American Institute of Physics.

引用

页码：4033 / 4035

页数：3

共 23 条

[11]

2-L

[12] Optical gain and stimulated emission in nanocrystal quantum dots [J].