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Preparation and Spectroscopic Investigation of CdS/CdSe/CdS Quantum-Dot Quantum-Well Heterostructures

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Abstract:

CdS/CdSe/CdS quantum-dot quantum-well heterostructures with the different thicknesses of CdSe well layers were synthesized by using the colloidal chemical method. The absorption, photoluminescence and Raman scattering spectra of CdS cores, and CdS/CdSe, CdS/CdSe/CdS structures were investigated. A comparative study of their optical properties confirmed the formation of CdSe well and exterior CdS shell. Raman spectra of the nanostructures exhibit the quantum confinement of the optical phonons and the appearance of the surface phonons. It was found that the temperature dependence of the photoluminescence emission energy is described by Varshni relation with the different temperature coefficients for CdS/CdSe and CdS/CdSe/CdS structures. Upconversion luminescence was observed at low temperatures. The optical and vibrational properties of quantum-dot quantum-well heterostructures have been discussed.

Keywords: ABSORPTION; CDS/CDSE/CDS HETEROSTRUCTURE; PHOTOLUMINESCENCE; RAMAN SCATTERING; UPCONVERSION LUMINESCENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.C002

Publication date: February 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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