Surface ion engineering for tuning dual emission of ZnxCd1−xS nanocrystals

Abstract

Oleate capped Zn doped CdS (Zn_xCd_1−xS) colloidal nanocrystal exhibited dual emission, which was tunable by selective removal of the cations, over its surface and in its immediate vicinity, using cation exchange resin beads (CB). The near band gap emission disappeared more rapidly in comparison to deep level emission, the peak wavelength of which shifted by as much as 25 nm, while both exhibited increasingly faster decay.