Preparation of ZnSe-ZnS alloy quantum dots by a hydrothermal method and their optical properties

Abstract

Abstract We prepared colloidal ZnSe x S 1− x alloy quantum dots (QDs) and investigated their optical properties. ZnSe x S 1− x QDs were successfully prepared by a hydrothermal method, which was confirmed by the results of X-ray structural analysis. When the alloy composition was decreased from x = 1 to 0, the absorption energy continuously shifted to the high energy side. Band-edge photoluminescence (PL) was the main PL band in ZnSe QDs, whereas only defect - related PL band was observed in ZnS QDs. The band-edge PL was clearly observed as the main PL band for x = 0.52 to 1, which shifted to the high energy side by decreasing x .