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Title: An approach for optimizing the shell thickness of core-shell quantum dots using photoinduced charge transfer
Authors: Vinayakan, R
Shanmugapriya, T
Pratheesh V Nair
Ramamurthy, P
George Thomas, K
Keywords: Photoinduced charge transfer dynamics
Quantum dots
Photoluminescence quenching
Electron transfer process
Issue Date: 19-Jul-2007
Publisher: American Chemical Society, USA
Citation: Journal of Physical Chemistry C III(28):10146-10149; 19 Jul 2007
Abstract: Photoinduced charge-transfer dynamics between CdSe quantum dots (QDs) possessing varying monolayers of ZnS and hole scavengers such as phenothiazine (PT) and N- methylphenothiazine (NMPT) were investigated for optimizing the shell thickness of core - shell quantum dots. Spectroscopic investigations indicate that phenothiazine binds onto the surface of bare CdSe QDs, resulting in the photoluminescence quenching, and two monolayers of ZnS prevent the electron -transfer process. Methodologies presented here can provide quantitative information on the optimum shell thickness of core - shell QDs, which can suppress the undesired electron transfer and provide maximum luminescence yield.
Appears in Collections:2007

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