Electronic Excitation Energy Transfer in an Array of CdS Quantum Dots on a Quasi-Two-Dimensional Surface

The optical spectra of films composed of spherical silicon-dioxide particles coated with small-radius CdS quantum dots are recorded and analyzed. Large shifts of the absorption and photoluminescence bands are detected and studied in relation to the concentration of quantum dots and to the pumping de...

Full description

Saved in:
Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2019-02, Vol.53 (2), p.188-194
Main Authors: Bondar, N. V., Brodyn, M. S., Matveevskaya, N. A., Beynik, T. G.
Format: Article
Language:English
Subjects:
ABSORPTION
Cadmium sulfide
CADMIUM SULFIDES
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ENERGY TRANSFER
EXCITATION
EXPERIMENTAL DATA
GAUSS FUNCTION
Low-Dimensional Systems
Magnetic Materials
Magnetism
Optical pumping
Particle size distribution
PHOTOLUMINESCENCE
Physics
Physics and Astronomy
PUMPING
QUANTUM DOTS
Quantum Phenomena
Semiconductor Structures
Silicon
SILICON OXIDES
SPECTRA
SPHERICAL CONFIGURATION
STRONG INTERACTIONS
Strong interactions (field theory)
SURFACES
THIN FILMS
TUNNEL EFFECT
TWO-DIMENSIONAL SYSTEMS
WAVELENGTHS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The optical spectra of films composed of spherical silicon-dioxide particles coated with small-radius CdS quantum dots are recorded and analyzed. Large shifts of the absorption and photoluminescence bands are detected and studied in relation to the concentration of quantum dots and to the pumping density and wavelength. Analysis of the experimental data shows that the effects are due to electronic excitation energy transfer by particles through the mechanism of tunneling induced by a strong interaction between quantum dots. The results obtained at low pumping densities and different excitation wavelengths make it possible to describe the size distribution of CdS quantum dots. This distribution can be adequately approximated with a Gaussian function.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782619020040