(A) Emission wavelengths of 3.8 nm CdTe cores capped with ZnSe, CdSe, or ZnTe, or one monolayer of ZnTe followed by ZnSe (ZnTe/ZnSe), or one monolayer of CdSe followed by ZnSe (CdSe/ZnSe). (B) Fluorescence quantum yields of 3.8 nm CdTe cores capped with either ZnSe or CdSe, and CdSe QDs (3.8 nm) capped with ZnS for different shell thicknesses. (C) Diagrams of band offsets for core/shell nanocrystals in (A), as calculated by using the model-solid theory and a continuum elasticity model for the impact of strain (see Methods).