INVESTIGATION OF THE PHOTOLUMINESCENCE PROPERTIES OF ZnSe and ZnSe:Cu NANAOCRYSTALS (NCs)

Abstract

In this work, ZnSe and ZnSe : Cu nanocrystals (NCs) were synthesized using a simple aqueous thermochemical approach. XRD pattern demonstrated cubic structure (zinc blende) of ZnSe NCs with an average size around 2.5 nm. The band gap of as-prepared ZnSe NCs was about 3.5 eV and by increasing the heating time the band gap of NCs was decreased. The PL spectra of as-prepared ZnSe NCs showed trap state emission, but by increasing the heating time, it indicated the band edge emission. For ZnSe : Cu NCs, the PL peak was shifted from 470 nm to 565 nm by increasing the heating time.