Spectrally resolved resonance energy transfer from ZnO:MgO nanocrystals

Rakshit, Sabyasachi ; Vasudevan, Sukumaran (2009) Spectrally resolved resonance energy transfer from ZnO:MgO nanocrystals Journal of Physical Chemistry C, 113 (37). pp. 16424-16431. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp906202e

Related URL: http://dx.doi.org/10.1021/jp906202e

Abstract

Resonance energy transfer (RET) from the visible emission of core-shell ZnO:MgO nanocrystals to Nile Red chromophores, following band gap excitation in the UV, has been investigated for four different nanocrystal sizes. With use of steady state and time-resolved fluorescence spectroscopic measurements the wavelength dependent RET efficiencies have been determined. The RET process in ZnO:MgO nanocrystals occurs from emissions involving trap state recombination. There are two such processes with different RET efficiencies for the same particle size. This is shown to be a consequence of the fact that the recombination processes giving rise to the two emissions are located at different distances from the center of the particle so that the donor-acceptor distances for the two are different, even for the same particle size.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:58435
Deposited On:31 Aug 2011 06:08
Last Modified:31 Aug 2011 06:08

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