Photoluminescence dynamics of Mn2+-doped CdS/ZnS Core/Shell nanocrystals: Mn2+ concentration dependence

摘要

The controlled doping of impurities into semiconductor nanocrystals is essential for producing and enhancing optical and magnetic functionalities. We fabricated Mn2+-doped US nanocrystals overcoated with a ZnS shell layer (CdS:Mn/ZnS core/shell nanocrystals) and studied photoluminescence (PL) properties of CdS:Mn/ZnS core/shell nanocrystals with different Mn2+ concentrations. The intensity and decay profile of the Mn2+ intra-3d transition PL are determined by the Mn2+ concentration. Our findings suggest that the Mn2+ concentration dependence of the PL dynamics is caused by exchange-coupled Mn pairs in nanocrystals.