Effect of ZnS shell on optical properties of Ni-doped ZnSe nanocrystals

The present paper aims to suggest a simple/fast route for direct preparation of the Ni-doped ZnSe/ZnScore/shell NCs in aqueous solution. Using XRD measurement, the zinc blend structure and sub-5 nm average size ofthe NCs was proved. The FT-IR spectrum also showed the passivation of the NCs surface by means of the deprotonatedthiol terminals of the NAC molecules. The intensity of the dopant-related emission at about 476 nm in Ni:ZnSe dopedNCs was found to experience more than four times enhancement by utilization of the extra ZnS shell. It was alsoobserved that the increasing of the shell overcoating time from 1 to 3 h, has effective role on better passivation of thesurface of the NCs and increasing of the emission intensity.

کلیدواژه ها:

Colloidal synthesis ، Ni-doped ZnSe NCs ، Core/shell structures ، Photoluminescence emission