Calculating the influence of external charges on the photoluminescence of a CdSe quantum dot

Article Abstract:

Atomistic empirical pseudopotential calculations are used for determining the influence of external charges on the radiative recombination rate of an electron-hole pair and the photoluminescence of a CdSe quantum dot. It is seen that when the negative external charge is near the surface of the CdSe quantum dot, then its Coulomb potential could be very strong and capable of pulling the hole away from the electron, thus resulting in the reduction of the radioactive recombination rate.

Photoluminescence

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Temperature-dependent energy transfer in cadmium telluride quantum dot solids

Article Abstract:

Efficiently luminescing colloidal CdTe quantum dots (QDs) were used for the preparation of monodispersed and mixed sized QD solids and luminescence spectra and decay times of the QD emission were measured as a function of temperature to study energy transfer (ET) processes in the QD solids. Studies of ET in heteronuclear QD solids show that ET is dominated by a single-step ET process.

Energy transformation

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Interplay between Auger and ionization processes in a nanocrystals quantum dots

Article Abstract:

The interplay between Auger effects and ionization processes are studied in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. The results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states.

Sulfur Compounds, Cadmium Compounds, Zinc compounds, Sulphur compounds, Auger effect

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