Abstract

The steady-state and time-resolved luminescent properties of CdSe/CdS core/shell quantum dots are discussed. A combination of UV-Visible absorption spectroscopy photoluminescence (PL) spectroscopy and up-conversion luminescence is employed to analyze the optical characters. Near IR laser (800nm) excitation causes a blue shift of the emission peak compared to 400 nm laser excitation. It is found that up-conversion luminescence is composed of a photoinduced trapping and a band edge excitonic state. The blue shift of the emission peak is caused by the relative change in luminescence intensity between excitonic and trapping states.

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