PHOTOLUMINESCENCE INVESTIGATIONS OF TRANSITION METAL (Ni, Co) DOPED ZnS NANOCRYSTALS

Abstract

In the present investigation, Nickle and Cobalt (Transition metals) doped ZnS Nanocrystals were synthesized by wet chemical route using methanol water binary mixture as a solvent. 1-20% doped percent of dopant were used. The synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and photoluminescence (PL) spectroscopy for structural and optical investigations. Phase and structural analysis confirmed the formation of cubic ZnS having nearly spherical shaped nanoparticles having size ~3 nm. PL spectra showed broad and asymmetric band centered nearly at 435 nm. The intensity of PL peaks showed gradual quenching with increasing dope percentage which makes it unsuitable for biological imaging applications.