White-light emission from zinc chalcogenide alloy quantum dots with gradient compositions

Abstract Zn(Te1−xSx) quantum dots (QDs) surrounded by a ZnS shell were synthesized using a standard hot-injection method. The obtained Zn(Te1−xSx) QDs consisted of a Te-rich center and an outer layer with a gradient composition in which the S concentration increased with increasing distance from the center. The Te-rich portion of the Zn(Te1−xSx) QDs had a composition range of 0.2 ≤ x ≤ 0.5 and a diameter