Transient Fluorescence of the Off State in Blinking CdSe/CdS/ZnS Semiconductor Nanocrystals Is Not Governed by Auger Recombination

被引：148
|
作者：
Rosen, Shamir [1 ]
Schwartz, Osip [1 ]
Oron, Dan [1 ]
机构：
[1] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 15期
关键词：
COLLOIDAL QUANTUM DOTS; INTERMITTENCY; INTENSITY;
D O I：
10.1103/PhysRevLett.104.157404
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The observed intermittent light emission from colloidal semiconductor nanocrystals has long been associated with Auger recombination assisted quenching. We test this view by observing transient emission dynamics of CdSe/CdS/ZnS semiconductor nanocrystals using time-resolved photon counting. The size and intensity dependence of the observed decay dynamics seem inconsistent with those expected from Auger processes. Rather, the data suggest that in the "off'' state the quantum dot cycles in a three-step process: photoexcitation, rapid trapping, and subsequent slow nonradiative decay.
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页数：4
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