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Title: Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation

Abstract

We studied the impact of photophysical and photochemical processes on the interdot Forster energy transfer in monodisperse CdSe/ZnS quantum dot solids. For this, we investigated emission spectra of CdSe/ZnS quantum dot solids in the vicinity of gold metallic nanoparticles coated with chromium oxide. The metallic nanoparticles were used to enhance the rate of the energy transfer between the quantum dots, while the chromium oxide coating led to significant increase of their photo-oxidation rates. Our results showed that irradiation of such solids with a laser beam can lead to unique spectral changes, including narrowing and blue shift. We investigate these effects in terms of inhibition of the plasmonically enhanced interdot energy transfer between quantum dots via the chromium-oxide accelerated photo-oxidation process. We demonstrate this considering energy-dependent rate of the interdot energy transfer process, plasmonic effects, and the way photo-oxidation enhances non-radiative decay rates of quantum dots with different sizes.

Authors:
 [1];  [2]; ;  [1]
  1. Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22089548
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM SELENIDES; CHROMIUM OXIDES; EMISSION SPECTRA; ENERGY DEPENDENCE; ENERGY TRANSFER; GOLD; IRRADIATION; PHOTOCHEMISTRY; PHOTOLUMINESCENCE; QUANTUM DOTS; RADIATIVE DECAY; SEMICONDUCTOR LASERS; SEMICONDUCTOR MATERIALS; SOLIDS; ZINC SULFIDES

Citation Formats

Sadeghi, S. M., Nano and Micro Device Center, University of Alabama in Huntsville, Huntsville, Alabama 35899, Nejat, A., and West, R. G. Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation. United States: N. p., 2012. Web. doi:10.1063/1.4766282.
Sadeghi, S. M., Nano and Micro Device Center, University of Alabama in Huntsville, Huntsville, Alabama 35899, Nejat, A., & West, R. G. Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation. United States. doi:10.1063/1.4766282.
Sadeghi, S. M., Nano and Micro Device Center, University of Alabama in Huntsville, Huntsville, Alabama 35899, Nejat, A., and West, R. G. Thu . "Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation". United States. doi:10.1063/1.4766282.
@article{osti_22089548,
title = {Inhibition of plasmonically enhanced interdot energy transfer in quantum dot solids via photo-oxidation},
author = {Sadeghi, S. M. and Nano and Micro Device Center, University of Alabama in Huntsville, Huntsville, Alabama 35899 and Nejat, A. and West, R. G.},
abstractNote = {We studied the impact of photophysical and photochemical processes on the interdot Forster energy transfer in monodisperse CdSe/ZnS quantum dot solids. For this, we investigated emission spectra of CdSe/ZnS quantum dot solids in the vicinity of gold metallic nanoparticles coated with chromium oxide. The metallic nanoparticles were used to enhance the rate of the energy transfer between the quantum dots, while the chromium oxide coating led to significant increase of their photo-oxidation rates. Our results showed that irradiation of such solids with a laser beam can lead to unique spectral changes, including narrowing and blue shift. We investigate these effects in terms of inhibition of the plasmonically enhanced interdot energy transfer between quantum dots via the chromium-oxide accelerated photo-oxidation process. We demonstrate this considering energy-dependent rate of the interdot energy transfer process, plasmonic effects, and the way photo-oxidation enhances non-radiative decay rates of quantum dots with different sizes.},
doi = {10.1063/1.4766282},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 10,
volume = 112,
place = {United States},
year = {2012},
month = {11}
}