Absorption of light by colloidal semiconductor quantum dots

Sergey I. Pokutnyi; Oleg V. Ovchinnikov; Tamara S. Kondratenko

doi:10.1117/1.JNP.10.033506

2 March 2016 Absorption of light by colloidal semiconductor quantum dots

Sergey I. Pokutnyi, Oleg V. Ovchinnikov, Tamara S. Kondratenko

Author Affiliations +

Journal of Nanophotonics, Vol. 10, Issue 3, 033506 (March 2016). https://doi.org/10.1117/1.JNP.10.033506

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 (1S_3/2 and 2S_3/2), located in QDs valence band and fundamental size-quantized states 1S_e 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.

Citation Download Citation

Sergey I. Pokutnyi, Oleg V. Ovchinnikov, and Tamara S. Kondratenko "Absorption of light by colloidal semiconductor quantum dots," Journal of Nanophotonics 10(3), 033506 (2 March 2016). https://doi.org/10.1117/1.JNP.10.033506

Published: 2 March 2016

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