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2 Oct 2006

Volume 89, Issue 14, Articles (14xxxx)

Appl. Phys. Lett. 89, 142101 (2006); http://dx.doi.org/10.1063/1.2358202 (3 pages)

H. C. Lin, P. D. Ye, Y. Xuan, G. Lu, A. Facchetti, and T. J. Marks

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APPLIED BIOPHYSICS

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Resonance energy transfer based on shallow and deep energy levels of biotin-polyethylene glycol/polyamine stabilized CdS quantum dots

W. Lü, Y. Tokuhiro, I. Umezu, A. Sugimura, and Y. Nagasaki

Appl. Phys. Lett. 89, 143901 (2006); http://dx.doi.org/10.1063/1.2359295 (3 pages) | Cited 5 times

Online Publication Date: 6 October 2006

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Fluorescent resonance energy transfer between the poly(ethylene glycol)-b-poly(2-(N,N-dimethylamino)ethyl methacrylate) stabilized CdS quantum dots (QDs) and texas-red streptavidin was observed. We propose a four-state model to explain photoluminescence (PL) process of CdS QDs and suggest that there are two emission processes originated from shallow and deep trap energy levels corresponding to fast and slow components of PL decay, respectively. Energy transfer mechanism was discussed based on Dexter theory [ J. Chem. Phys. 21, 863 (1953) ] and the proposed four-state model. It is found that the energy transfer efficiency of deep energy level is higher than that of shallow energy level. The calculated distance between QD and texas red with the parameters of shallow energy level is the same with that of deep level, which indicates that the proposed model is reasonable for explaining the PL dynamics of CdS QDs.

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