Energy Transfer between J-Aggregate/NQD Hybrid Structures
Aggregates of the cyanine dyes are a class of fluorophores with greatly
enhanced absorption and emission properties resulting from the coherent
coupling of tens to hundreds of aligned monomer molecules. Tuning the
aggregate structure influences the intermolecular excitonic interactions
that couple to the optical transitions of the individual molecules in
the aggregate. As such, J-aggregates of cyanine dyes have received
considerable attention in regard to their applications in
optoelectronics and sensors.
We study near-field (dipole -dipole) interactions in blends and
multilayers of J-Aggregates and colloidal CdSe nanocrystals. It recently
has been found that nanocrystals can transfer excitonic energy to JAs
via near field, Forster-type interaction in layered structures across
~20 nm distance. [1] Hence, such hybrid system may present considerable
interest in structures relying on the orderly energy flow and in optical
“antennae” systems. We had been employing J-aggregates (TDBC and TCC) in
layered structures with “giant” nanocrystals (in collaboration with
group of Dr. Hollingsworth at LANL) to aid in energy extraction from
optical excited nanoparticles. [2]
References:
[1] Q. Zhang, T. Atay, J.R.
Tischler, M. S. Bradley, V. Bulovic´, and A. V. Nurmikko, “Highly
efficient resonant coupling of optical excitations in hybrid
organic/inorganic semiconductor nanostructures”,
Nature Nanotechnology2,
555 (2007)
[2]
A. Radja, H. M. Nguyen, J. A. Hollingsworth and A.V. Malko,
“Ultrafast exciton energy transfer from giant nanocrystals to layered
J-aggregate films”, American
Physical Society Meeting, 2013