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Proceedings Paper

Highly-efficient Förster resonance energy transfer in hybrid organic/inorganic semiconductor nanostructures
Author(s): Diana Savateeva; Dzmitry Melnikau; Yury P. Rakovich
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Paper Abstract

Highly luminescent semiconductor nanocrystals or quantum dots (QDs) possess a number of interesting and important properties that are tunable thanks to their size-dependent discrete electronic spectra. In this work we studied the optical properties of a novel type of hybrid structures that combine CdTe QDs with organic dye molecules (Pseudocyanine iodide) in a J-aggregate state. Due to the excitonic nature of electronic excitations, J-aggregates have the narrowest absorption and luminescence bands among organic materials, large oscillator strengths and giant third-order nonlinear susceptibility. In developed structures optical energy harvested by the quantum dots as artificial antennas then transferred to J-aggregates to enhance the photostability and efficiency of the carriers recombination. To fabricate CdTe/J-aggregates hybrid nanostructures we have used an approach based on electrostatic interaction between the positively charged dye and CdTe QDs capped with thioglycolic acid and, thus, carrying a negative charge. In order to develop an efficient hybrid material operating in the FRET regime, we carefully selected the PL colors (diameters) of the QD to be optically coupled with absorption of J-aggregates. We took advantage of extremely thin ligand shell (~0.5 nm) of CdTe QDs, which insures high efficiency of energy transfer. Formed QD/J-aggregate FRET system shows the broadband absorption in the visible and the ultraviolet part of the spectrum typical of QDs, along with the narrow emission linewidths characteristic of J-band emitters (~15 nm full width at half-maximum). We use absorption and photoluminescence spectroscopy and photoluminescence lifetime studies to conclude that efficiency of energy transfer is 95%. Also we report on development of active whispering-gallery microcavities integrated with with hybrid QDs/J-aggregate shell. Results of micro-PL spectroscopy and PL lifetime imaging confirm strong quenching of QDs emission and multifold shortening of their photoluminescence lifetime, which is consistent with highly efficient FRET in hybrid organic/inorganic semiconductor nanostructures coupled to microcavity modes.

Paper Details

Date Published: 1 May 2012
PDF: 8 pages
Proc. SPIE 8424, Nanophotonics IV, 842427 (1 May 2012); doi: 10.1117/12.921817
Show Author Affiliations
Diana Savateeva, Centro de Fisica de Materiales (Spain)
Dzmitry Melnikau, CIC nanoGUNE Consolider (Spain)
Yury P. Rakovich, Centro de Fisica de Materiales (Spain)
Basque Foundation for Science (Spain)

Published in SPIE Proceedings Vol. 8424:
Nanophotonics IV
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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