Excitation intensity dependence of power-law blinking statistics in nanocrystal

Quantum Dots, Kenichi Goushi, Toshiki Yamada, Akira Otomo

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We present new information that requires explanation in the study of possible mechanisms for fluorescence blinking in single nanocrystal (NC) quantum dots. By using pulse laser excitation, we investigated the excitation intensity dependence of fluorescence blinking statistics in NC quantum dots embedded in polymer matrices. Under strong excitation intensity, we observed an unexpected excitation intensity dependence of the powerlaw distribution in the blinking statistics. To explain the new information on the blinking statistics in the framework of the Tang-Marcus model, we propose a diffusion-controlled model based upon anharmonic potentials that originate from a nonlinear response of polarization to the electric field and is caused by an increase in the dielectric constant of host media with the excitation intensity. The validity of the proposed model is investigated by comparing the blinking statistics for two host matrices.

Original languageEnglish
Pages (from-to)20161-20168
Number of pages8
JournalJournal of Physical Chemistry C
Volume113
Issue number47
DOIs
Publication statusPublished - Dec 8 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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