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.

引用

页数：4

共 15 条

[11] Off-State Quantum Yields in the Presence of Surface Trap States in CdSe Nanocrystals: The Inadequacy of the Charging Model To Explain Blinking
Califano, Marco
JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (37): : 18051 - 18054
[12] Light output and fluorescence efficiency of polymer layers containing colloidal semiconductor phosphors based on CdSe/CdS/ZnS quantum dots
Pavlov, S. A.
Krikushenko, V. V.
Antipov, E. M.
Voronets, N. B.
Maksimova, E. Yu.
Sherstneva, N. E.
Koryakin, S. L.
OPTICS AND SPECTROSCOPY, 2015, 119 (02) : 327 - 331
[13] Light output and fluorescence efficiency of polymer layers containing colloidal semiconductor phosphors based on CdSe/CdS/ZnS quantum dots
S. A. Pavlov
V. V. Krikushenko
E. M. Antipov
N. B. Voronets
E. Yu. Maksimova
N. E. Sherstneva
S. L. Koryakin
Optics and Spectroscopy, 2015, 119 : 327 - 331
[14] Challenge to the Charging Model of Semiconductor-Nanocrystal Fluorescence Intermittency from Off-State Quantum Yields and Multiexciton Blinking
Zhao, Jing
Nair, Gautham
Fisher, Brent R.
Bawendi, Moungi G.
PHYSICAL REVIEW LETTERS, 2010, 104 (15)
[15] Band edge recombination in CdSe, CdS and CdSxSe1-x alloy nanocrystals observed by ultrafast fluorescence upconversion:: The effect of surface trap states
Garrett, Maria Danielle
Dukes, Albert D., III
McBride, James R.
Smith, Nathanael J.
Pennycook, Stephen J.
Rosenthal, Sandra J.
JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (33): : 12736 - 12746

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