We have investigated the temperature and shell thickness effects on the extinction and photoluminescence (PL) optical properties in II-VI semiconductor core-shells of type I. To this purpose, we used Maxwell-Garnett (M-G) effective theory by defining appropriate dielectric functions for the constitutive materials of the core-shells. We have obtained one sharp resonant peak which can be related to the 1Sh→1Se optical transition, which is red-shifted with the increase of shell thickness. This peak is also red-shifted with increasing temperature due to core shrinking band gap described by Varshni´s law. For the PL spectra, we have considered radiative and non-radiative decay rates as the main processes that can lead to the carrier relaxation. The Stokes shift between the absorption- and PL- peaks is of the order of a few meV. Finally, our findings are similar to that reported in the literature in absorption and PL experimental spectra.Keywords: Semiconductor nanostructures, Maxwell-Garnett theory, optical properties
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