Model of Fluorescence Intermittency of Single Colloidal Semiconductor Quantum Dots Using Multiple Recombination Centers

被引:181
作者
Frantsuzov, Pavel A. [1 ]
Volkan-Kacso, Sandor [1 ]
Janko, Boldizsar [1 ]
机构
[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
基金
美国国家科学基金会;
关键词
POWER-LAW BEHAVIOR; PHOTOLUMINESCENCE INTENSITY; BLINKING STATISTICS; NANOCRYSTALS; NANOWIRES; KINETICS; NANORODS; EMITTERS; NOISE;
D O I
10.1103/PhysRevLett.103.207402
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a new physical model resolving a long-standing mystery of the power-law distributions of the blinking times in single colloidal quantum dot fluorescence. The model considers the nonradiative relaxation of the exciton through multiple recombination centers. Each center is allowed to switch between two quasistationary states. We point out that the conventional threshold analysis method used to extract the exponents of the distributions for the on times and off times has a serious flaw: the qualitative properties of the distributions strongly depend on the threshold value chosen for separating the on and off states. Our new model explains naturally this threshold dependence, as well as other key experimental features of the single quantum dot fluorescence trajectories, such as the power-law power spectrum (1/f noise).
引用
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页数:4
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