Phonons contribution to the infrared and visible spectra of II-VI semiconductor core-shell nanocrystals

► We investigate the bulk phonons contribution to the IR as well as the VIS spectra of II-VI nanoshells. ► We use Mie scattering theory by defining appropriate dielectric functions for the constitutive materials of the nanoshells. ► The effects of: (i) phonons, (ii) size of NCs and (iii) islanding medium are investigated in the IR and VIS range. ► Finite potential confinement is used to evaluate the exciton energy in effective mass approximation.