An approach for optimizing the shell thickness of core-shell quantum dots using photoinduced charge transfer

Vinayakan, R. ; Shanmugapriya, T. ; Nair, Pratheesh V. ; Ramamurthy, P. ; George Thomas, K. (2007) An approach for optimizing the shell thickness of core-shell quantum dots using photoinduced charge transfer The Journal of Physical Chemistry C, 111 (28). pp. 10146-10149. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp072823h

Related URL: http://dx.doi.org/10.1021/jp072823h

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.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:51392
Deposited On:28 Jul 2011 11:47
Last Modified:28 Jul 2011 11:47

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