Electronic excitation transfer from an organic matrix to CdS nanocrystals produced by the Langmuir–Blodgett method

The absorption, photoluminescence, and photoluminescence excitation spectra of CdS nanocrystals formed by the Langmuir–Blodgett method are explored. Features of the absorption and photoluminescence excitation spectra defined by optical transitions in the matrix and nanocrystals are identified. The e...

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Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2017-05, Vol.51 (5), p.576-581
Main Authors: Zarubanov, A. A., Plyusnin, V. F., Zhuravlev, K. S.
Format: Article
Language:English
Subjects:
Absorption
CADMIUM SULFIDES
CHARGE CARRIERS
Charge transfer
Current carriers
EXCITATION
Excitation spectra
Excitons
Hole size
Interaction with Radiation
Langmuir-Blodgett films
Magnetic Materials
Magnetism
MATERIALS SCIENCE
MATRICES
Methods
MEV RANGE
Nanocrystals
NANOSTRUCTURES
PHOTOLUMINESCENCE
Physics
Physics and Astronomy
Spectroscopy
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description The absorption, photoluminescence, and photoluminescence excitation spectra of CdS nanocrystals formed by the Langmuir–Blodgett method are explored. Features of the absorption and photoluminescence excitation spectra defined by optical transitions in the matrix and nanocrystals are identified. The efficiency of electronic excitation transfer from an organic matrix to nanocrystals is studied. It is shown that charge carriers efficiently transfer from the matrix to electron and hole size-quantization levels in nanocrystals and to acceptor defect levels in the band gap of nanocrystals. A large Stokes shift defined by fine exciton structure (bright and dark excitons) is observed. The shift is in the range 140–220 meV for nanocrystals 2.4 and 2.0 nm in radius.
doi_str_mv 10.1134/S1063782617050268
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subjects Absorption
CADMIUM SULFIDES
CHARGE CARRIERS
Charge transfer
Current carriers
EXCITATION
Excitation spectra
Excitons
Hole size
Interaction with Radiation
Langmuir-Blodgett films
Magnetic Materials
Magnetism
MATERIALS SCIENCE
MATRICES
Methods
MEV RANGE
Nanocrystals
NANOSTRUCTURES
PHOTOLUMINESCENCE
Physics
Physics and Astronomy
Spectroscopy
title Electronic excitation transfer from an organic matrix to CdS nanocrystals produced by the Langmuir–Blodgett method
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