Recombination dynamics of luminescence in colloidal CdSe/ZnS quantum dots

Authors: Lee, W.Z.; Shu, G.W.; Wang, J.S.; Shen, J.L.; Lin, C.A.; Chang, W.H.; Ruaan, R.C.; Chou, W.C.; Lu, C.H.; Lee, Y.C.

Source: Nanotechnology, Volume 16, Number 9, September 2005 , pp. 1517-1521(5)

Publisher: Institute of Physics Publishing

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Abstract:

Recombination dynamics of photoluminescence (PL) in colloidal CdSe/ZnS quantum dots (QDs) were studied using time-resolved PL measurements. The PL intensity shows a biexponential decay at 9 K, consisting of a fast component (~1 ns) and a slow component (~6.3 ns). Based on the emission-energy and temperature dependence of carrier lifetimes, we suggest that the fast and slow PL decay of colloidal CdSe/ZnS QDs originates from recombination of the delocalized carriers in the internal core states and the localized carriers at the interface, respectively.

Document Type: Research article

DOI: 10.1088/0957-4484/16/9/018

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