Power law carrier dynamics in semiconductor nanocrystals at nanosecond timescales

We report the observation of power law dynamics on nanosecond to microsecond timescales in the fluorescence decay from semiconductor nanocrystals and draw a comparison between this behavior and power law fluorescence blinking from single nanocrystals. The link is supported by comparison of blinking and lifetime data measured simultaneously from the same nanocrystal. Our results reveal that the power law coefficient changes little over the nine decades in time from 10nsto10s, in contrast with the predictions of some diffusion based models of power law behavior.

[1]  A. Mews,et al.  Fluorescence decay time of single semiconductor nanocrystals. , 2002, Physical review letters.

[2]  David J. Nesbitt,et al.  Modeling distributed kinetics in isolated semiconductor quantum dots , 2003 .

[3]  Norris,et al.  Size dependence of exciton fine structure in CdSe quantum dots. , 1996, Physical review. B, Condensed matter.

[4]  R. Marcus,et al.  Diffusion-controlled electron transfer processes and power-law statistics of fluorescence intermittency of nanoparticles. , 2005, Physical review letters.

[5]  Spin dynamics in semiconductor nanocrystals , 2002, cond-mat/0204235.

[6]  Jean-Philippe Bouchaud,et al.  Lévy Statistics and Laser Cooling , 2001 .

[7]  Robert Neuhauser,et al.  Blinking statistics in single semiconductor nanocrystal quantum dots , 2001 .

[8]  J. Bouchaud,et al.  Lévy Statistics and Laser Cooling: Index of main notation , 2001 .

[9]  A. Monkman,et al.  Violation of the exponential-decay law at long times. , 2006, Physical review letters.

[10]  M Dahan,et al.  Statistical aging and nonergodicity in the fluorescence of single nanocrystals. , 2002, Physical review letters.

[11]  R. Marcus,et al.  Mechanisms of fluorescence blinking in semiconductor nanocrystal quantum dots. , 2005, The Journal of chemical physics.

[12]  Victor I. Klimov,et al.  Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime , 2003 .

[13]  D. P. Fromm,et al.  Nonexponential “blinking” kinetics of single CdSe quantum dots: A universal power law behavior , 2000 .

[14]  R. A. Marcus,et al.  Explanation of quantum dot blinking without the long-lived trap hypothesis , 2005 .

[15]  Aging correlation functions for blinking nanocrystals, and other on-off stochastic processes. , 2004, The Journal of chemical physics.

[16]  Michel Orrit,et al.  Simple model for the power-law blinking of single semiconductor nanocrystals , 2002 .