Abstract
We study spectrally resolved dynamics of Förster energy transfer in single monolayers and bilayers of semiconductor nanocrystal quantum dots assembled using Langmuir-Blodgett (LB) techniques. For a single monolayer, we observe a distribution of transfer times from ∼50 ps to ∼10 ns, which can be quantitatively modeled assuming that the energy transfer is dominated by interactions of a donor nanocrystal with acceptor nanocrystals from the first three "shells" surrounding the donor. We also detect an effective enhancement of the absorption cross section (up to a factor of 4) for larger nanocrystals on the "red" side of the size distribution, which results from strong, interdot electrostatic coupling in the LB film (the light-harvesting antenna effect). By assembling bilayers of nanocrystals of two different sizes, we are able to improve the donor-acceptor spectral overlap for engineered transfer in a specific ("vertical") direction. These bilayers show a fast, unidirectional energy flow with a time constant of ∼120 ps.
| Original language | English |
|---|---|
| Pages (from-to) | 13782-13787 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry B |
| Volume | 107 |
| Issue number | 50 |
| Publication status | Published - Dec 18 2003 |
Fingerprint
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
Cite this
Picosecond Energy Transfer in Quantum Dot Langmuir - Blodgett Nanoassemblies. / Achermann, Marc; Petruska, Melissa A.; Crooker, Scott A.; Klimov, Victor I.
In: Journal of Physical Chemistry B, Vol. 107, No. 50, 18.12.2003, p. 13782-13787.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Picosecond Energy Transfer in Quantum Dot Langmuir - Blodgett Nanoassemblies
AU - Achermann, Marc
AU - Petruska, Melissa A.
AU - Crooker, Scott A.
AU - Klimov, Victor I
PY - 2003/12/18
Y1 - 2003/12/18
N2 - We study spectrally resolved dynamics of Förster energy transfer in single monolayers and bilayers of semiconductor nanocrystal quantum dots assembled using Langmuir-Blodgett (LB) techniques. For a single monolayer, we observe a distribution of transfer times from ∼50 ps to ∼10 ns, which can be quantitatively modeled assuming that the energy transfer is dominated by interactions of a donor nanocrystal with acceptor nanocrystals from the first three "shells" surrounding the donor. We also detect an effective enhancement of the absorption cross section (up to a factor of 4) for larger nanocrystals on the "red" side of the size distribution, which results from strong, interdot electrostatic coupling in the LB film (the light-harvesting antenna effect). By assembling bilayers of nanocrystals of two different sizes, we are able to improve the donor-acceptor spectral overlap for engineered transfer in a specific ("vertical") direction. These bilayers show a fast, unidirectional energy flow with a time constant of ∼120 ps.
AB - We study spectrally resolved dynamics of Förster energy transfer in single monolayers and bilayers of semiconductor nanocrystal quantum dots assembled using Langmuir-Blodgett (LB) techniques. For a single monolayer, we observe a distribution of transfer times from ∼50 ps to ∼10 ns, which can be quantitatively modeled assuming that the energy transfer is dominated by interactions of a donor nanocrystal with acceptor nanocrystals from the first three "shells" surrounding the donor. We also detect an effective enhancement of the absorption cross section (up to a factor of 4) for larger nanocrystals on the "red" side of the size distribution, which results from strong, interdot electrostatic coupling in the LB film (the light-harvesting antenna effect). By assembling bilayers of nanocrystals of two different sizes, we are able to improve the donor-acceptor spectral overlap for engineered transfer in a specific ("vertical") direction. These bilayers show a fast, unidirectional energy flow with a time constant of ∼120 ps.
UR - http://www.scopus.com/inward/record.url?scp=0346307185&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0346307185&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0346307185
VL - 107
SP - 13782
EP - 13787
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 50
ER -