The features of nonlinear absorption of two-photon excited excitons in CdSe/ZnS quantum dots

被引：23
|
作者：
Dneprovskii, V. [1 ]
Kozlova, M. [1 ]
Smirnov, A. [1 ]
Wumaier, T. [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2012年 / 44卷 / 09期
基金：
俄罗斯基础研究基金会;
关键词：
RESONANT EXCITATION; LUMINESCENCE; MICROCRYSTALS; LIGHT;
D O I：
10.1016/j.physe.2012.05.028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The nonlinear absorption features have been discovered in the case of two-photon resonant excitation of excitons in colloidal CdSe/ZnS quantum dots by powerful picosecond laser pulses. Two utilized methods - measurement of the traces of luminescence (the dependence of luminescence intensity upon distance) and nonlinear transmission measurement - have allowed us to determine the coefficients of two-photon absorption and to reveal the deviation from two-photon absorption and from the dependence of two-photon excited photoluminescence intensity upon distance at high excitation. The decreasing of two-photon absorption at high excitation was explained by accompanying processes of state-filling and Stark shift of exciton transition. The extinction of luminescence at high excitation was attributed to dominating nonradiative Auger recombination and to state-filling and Stark shift of exciton transition provoking the decreasing of two-photon absorption probability. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：1920 / 1923
页数：4
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