Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevB.72.125304
Title: Quantification of photoinduced and spontaneous quantum-dot luminescence blinking
Authors: Stefani, F.D.
Knoll, W.
Kreiter, M.
Zhong, X. 
Han, M.Y. 
Issue Date: 15-Sep-2005
Source: Stefani, F.D., Knoll, W., Kreiter, M., Zhong, X., Han, M.Y. (2005-09-15). Quantification of photoinduced and spontaneous quantum-dot luminescence blinking. Physical Review B - Condensed Matter and Materials Physics 72 (12) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.72.125304
Abstract: Photoluminescence blinking of Zn0.42Cd0.58Se colloidal quantum dots was investigated experimentally as a function of the excitation intensity and modeled via a Monte Carlo method. In order to test the current blinking model of electron tunneling to states external to the quantum dot, experiments were performed with quantum dots on (insulating) glass and (conducting) indium-tin-oxide substrates. Comparison of simulated and experimental data allows one to extract characteristic parameters of the blinking free of artifacts and shows that the blinking can be understood in terms of two independent processes. First, a process is active for switching between the on and off states and has a power-law probability distribution for the length of both on and off periods. Second, a single-rate transition from the on to the off state is evoked. The power-law blinking process is found to be insensitive to excitation intensity and the electronic states of the substrate and presents identical statistics for the two switching directions, pointing to an intrinsic symmetry. The single-rate on→off transition can account for all experimentally observed photoinduced and environmental (substrate) effects. On glass, its behavior is well described by a one-photon process in agreement with earlier studies on insulators. In contrast, a different behavior is found on the conducting substrates. © 2005 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/67246
ISSN: 10980121
DOI: 10.1103/PhysRevB.72.125304
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

50
checked on Dec 5, 2017

WEB OF SCIENCETM
Citations

43
checked on Nov 16, 2017

Page view(s)

53
checked on Dec 9, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.