We study the electronic structure of CdTe spheres (dots) and tetrapods by absorption, fluorescence, and photoluminescence-excitation (PLE) spectroscopy. A series of quantum dots with different diameter and tetrapods with varying arm length and diameter is investigated in solution at room temperature. We observe a significant impact of the geometrical shape of the nanocrystals on the optical response. In particular we find a double peak in the emission of tetrapods as a characteristic feature of this nanocrystal geometry. We observe a pronounced Stokes shift for the tetrapod and dot samples which depends sensitively on the crystal size. (c) 2005 Elsevier Ltd. All rights reserved.

Optical properties of colloidal nanocrystal spheres and tetrapods

CINGOLANI, Roberto
2005

Abstract

We study the electronic structure of CdTe spheres (dots) and tetrapods by absorption, fluorescence, and photoluminescence-excitation (PLE) spectroscopy. A series of quantum dots with different diameter and tetrapods with varying arm length and diameter is investigated in solution at room temperature. We observe a significant impact of the geometrical shape of the nanocrystals on the optical response. In particular we find a double peak in the emission of tetrapods as a characteristic feature of this nanocrystal geometry. We observe a pronounced Stokes shift for the tetrapod and dot samples which depends sensitively on the crystal size. (c) 2005 Elsevier Ltd. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/107887
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