Special Section on Optics, Spectroscopy, and Nanophotonics of Quantum Dots

Absorption of light by colloidal semiconductor quantum dots

[+] Author Affiliations
Sergey I. Pokutnyi

National Academy of Sciences of Ukraine, Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kiev UA 03164, Ukraine

Oleg V. Ovchinnikov, Tamara S. Kondratenko

Voronezh State University, Department of Optics and Spectroscopy, Universitetskay sq. 1, Voronezh 394006, Russia

J. Nanophoton. 10(3), 033506 (Mar 02, 2016). doi:10.1117/1.JNP.10.033506
History: Received November 18, 2015; Accepted February 11, 2016
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Abstract.  UV-Vis absorption of colloidal cadmium sulfide quantum dots (QDs) synthesized by an aqueous synthesis in a gelatin matrix was investigated. Using the dipole approximation, taking into account the Coulomb interaction between the electron and hole in a QD and the polarization effects on the spherical boundary of QD and matrix, it was found the change of selection rules for optical transitions. It is shown that the optical absorption edge of QDs is formed by two optical transitions of electron between low-excited levels of size quantization of heavy hole (1S3/2 and 2S3/2), located in QDs valence band and fundamental size-quantized states 1Se of conduction band. These transitions are identical in intensity. Estimations of average values of CdS QDs radius were realized using the developed formalism for UV-Vis absorption spectra. These data were compared with experimental values of this parameter, obtained using transmission electron microscope.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Sergey I. Pokutnyi ; Oleg V. Ovchinnikov and Tamara S. Kondratenko
"Absorption of light by colloidal semiconductor quantum dots", J. Nanophoton. 10(3), 033506 (Mar 02, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.033506


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