Design of semiconductor CdSe core ZnS/CdS multishell quantum dots for multiphoton applications

• Optical properties of colloidal II-VI semiconductor CdSe cores with ZnS and CdS multishell quantum dots (QDs) have been studied by experimental characterization and theoretical analysis. Due to the large number of energy states densely compacted in both conduction and valence bands of the quantum dots, strong interband and intraband optical couplings are induced by the multiphoton excitation, implicating an efficient fluorescence of such II-VI-based core-multishell CdSe QDs. This fact in combination with the advantage of the size tolerance of II-VI QDs with respect to the narrow fluorescence bandwidth make these systems excellent candidates for applications using fluorescence induced by multiphoton excitation.

Nyckelord

Cadmium compounds; Electron energy levels; Fluorescence; Multiphoton processes; Optical properties; Valence bands; Intraband optical couplings; Multiphoton excitation; Size tolerance

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