Picosecond Energy Transfer in Quantum Dot Langmuir - Blodgett Nanoassemblies

Marc Achermann, Melissa A. Petruska, Scott A. Crooker, Victor I Klimov

Research output: Contribution to journalArticle

183 Citations (Scopus)

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 languageEnglish
Pages (from-to)13782-13787
Number of pages6
JournalJournal of Physical Chemistry B
Volume107
Issue number50
Publication statusPublished - Dec 18 2003

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Energy transfer
Nanocrystals
Semiconductor quantum dots
nanocrystals
energy transfer
quantum dots
Monolayers
Langmuir Blodgett films
Beam plasma interactions
Langmuir-Blodgett films
assembling
absorption cross sections
time constant
Electrostatics
antennas
electrostatics
Semiconductor materials
Antennas
augmentation
interactions

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 journalArticle

Achermann, M, Petruska, MA, Crooker, SA & Klimov, VI 2003, 'Picosecond Energy Transfer in Quantum Dot Langmuir - Blodgett Nanoassemblies', Journal of Physical Chemistry B, vol. 107, no. 50, pp. 13782-13787.
Achermann, Marc ; Petruska, Melissa A. ; Crooker, Scott A. ; Klimov, Victor I. / Picosecond Energy Transfer in Quantum Dot Langmuir - Blodgett Nanoassemblies. In: Journal of Physical Chemistry B. 2003 ; Vol. 107, No. 50. pp. 13782-13787.
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