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Efficient Energy Transfer Between CdS Quantum Dots in Layer-by-layer Self-assembled Films

Published online by Cambridge University Press:  31 January 2011

Kunio Shimura,
DaeGwi Kim and
Masaaki Nakayama
Kunio Shimura
Affiliation:
shimura@a-phys.eng.osaka-cu.ac.jp, Osaka City University, Applied Physics, Osaka, Japan
DaeGwi Kim
Affiliation:
tegi@a-phys.eng.osaka-cu.ac.jp, Osaka City University, Applied Physics, Osaka, Japan
Masaaki Nakayama
Affiliation:
nakayama@a-phys.eng.osaka-cu.ac.jp, Osaka City University, Applied Physics, Osaka, Japan
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Abstract

We have investigated efficient energy transfer (ET) between CdS quantum dots (QDs) measuring photoluminescence dynamics in layer-by-layer (LBL) self-assembled films. The assembly of negatively charged colloidal QDs and positively charged polyelectrolytes results in QD/polymer multilayers. Furthermore, to reveal how the ET rate depends on the distance between CdS QDs, we fabricated bilayer structures consisting of differently sized CdS QDs. It is experimentally verified that ET between the donor and acceptor QDs is conclusively dominated by the dipole-dipole interaction.

Keywords

nanoscaleoptical propertiesluminescence

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