Photoluminescence quenching and conductivity enhancement of PVK induced by CdS quantum dots

TitlePhotoluminescence quenching and conductivity enhancement of PVK induced by CdS quantum dots
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2012
AuthorsMasala, S., Bizzarro V., Re Marilena, Nenna G., Villani Fulvia, Minarini Carla, and Di Luccio Tiziana
JournalPhysica E: Low-Dimensional Systems and Nanostructures
KeywordsAtomic force microscopy, Cadmium compounds, Cadmium sulfide, CdS, CdS quantum dots, Conductivity enhancement, Decomposition, High boiling solvents, Hybrid nanocomposites, Morphological properties, Nano-composite layers, Nanocomposites, Octadecene, Optical characterization, Photoluminescence, Photoluminescence quenching, Photoluminescence spectroscopy, Poly(N-vinylcarbazole), Quenching, Semiconductor quantum dots, Single-source precursor, Transmission electron microscopy, Transport properties, UV-vis absorptions

In this work we studied the optical and transport properties of hybrid nanocomposites of CdS quantum dots (QDs) and poly(N-vinylcarbazole) (PVK) polymer. The CdS QDs were prepared by thermal decomposition (thermolysis) of a single source precursor, Cd bis-thiolate, in a high boiling solvent, octadecene (ODE). The optical characterization of the QDs has been carried out by UV-vis absorption and photoluminescence spectroscopy while the morphological properties have been investigated atomic force microscopy and transmission electron microscopy. The analyses have shown that CdS QDs of diameter below 6 nm can be synthesized by such route with good light emission in the UV range. The QDs have been dispersed in a poly(N-vinylcarbazole) (PVK) matrix to obtain a PVK:CdS nanocomposite layers. An increase of conductivity and a quenching of the photoluminescence have been observed when the nanocomposite layer was inserted in ITO/PVK:CdS/Al structures. © 2012 Elsevier B.V.


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