PbSe/PbS and PbSe/PbSexS1-x Core/Shell Nanocrystals

The synthesis of PbSe/PbS and PbSe/PbSexS1–x core/shell nanocrystals (NCs) with luminescence quantum efficiencies of 45–55 % is reported. PbSe/PbS NCs are prepared via a two-stage process, while the PbSe/PbSexS1–x NCs are formed in a single-stage procedure. The core/shell NCs exhibit an energy tuning of the exciton transitions, with respect to that of the core NC, that is dependent on the core diameter, shell thickness, and composition.