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Int. J. Mol. Sci. 2012, 13(9), 11130-11140; doi:10.3390/ijms130911130
Article

Electric Field Induced Fluorescence Modulation of Single Molecules in PMMA Based on Electron Transfer

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State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, China
* Author to whom correspondence should be addressed.
Received: 12 July 2012 / Revised: 24 August 2012 / Accepted: 24 August 2012 / Published: 6 September 2012
(This article belongs to the Special Issue Advances in Single Molecule Spectroscopy)
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Abstract

We present a method to modulate the fluorescence of non-polar single squaraine-derived rotaxanes molecules embedded in a polar poly(methyl methacrylate) (PMMA) matrix under an external electric field. The electron transfer between single molecules and the electron acceptors in a PMMA matrix contributes to the diverse responses of fluorescence intensities to the electric field. The observed instantaneous and non-instantaneous electric field dependence of single-molecule fluorescence reflects the redistribution of electron acceptors in PMMA induced by electronic polarization and orientation polarization of polar polymer chains in an electric field.
Keywords: single-molecule fluorescence; modulation; external electric fields; polarization single-molecule fluorescence; modulation; external electric fields; polarization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Chen, R.; Gao, Y.; Zhang, G.; Wu, R.; Xiao, L.; Jia, S. Electric Field Induced Fluorescence Modulation of Single Molecules in PMMA Based on Electron Transfer. Int. J. Mol. Sci. 2012, 13, 11130-11140.

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