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 language | English |
|---|---|
| Pages (from-to) | 20161-20168 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry C |
| Volume | 113 |
| Issue number | 47 |
| DOIs | |
| Publication status | Published - Dec 8 2009 |
| Externally published | Yes |
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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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Excitation intensity dependence of power-law blinking statistics in nanocrystal. / Dots, Quantum; Goushi, Kenichi; Yamada, Toshiki; Otomo, Akira.
In: Journal of Physical Chemistry C, Vol. 113, No. 47, 08.12.2009, p. 20161-20168.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Excitation intensity dependence of power-law blinking statistics in nanocrystal
AU - Dots, Quantum
AU - Goushi, Kenichi
AU - Yamada, Toshiki
AU - Otomo, Akira
PY - 2009/12/8
Y1 - 2009/12/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=71049131714&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71049131714&partnerID=8YFLogxK
U2 - 10.1021/jp811448k
DO - 10.1021/jp811448k
M3 - Article
AN - SCOPUS:71049131714
VL - 113
SP - 20161
EP - 20168
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 47
ER -