Abstract
High quality type-I and type-II CdTe/CdS quantum dots (QDs) were designed and synthesized in water at 90°C using the same 3.0-nm CdTe core QDs with different CdS shell thicknesses. Time-resolved and temperature-dependent photoluminescence techniques were used to study comparatively their optical properties, showing strong luminescence peaking at 550nm with the short decay time of 20ns for type-I CdTe/CdS QDs; and strong luminescence in the near-infrared region of 700–830nm with very long decay time of 190ns for the type-II ones. In addition, exciton–acoustic phonon interaction is much stronger in type-I QDs compared to that in type-II ones that is rationally due to the stronger confinement effect.
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