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Issue 3, 2013
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A potential-controlled switch on/off mechanism for selective excitation in mixed electrochemiluminescent systems

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Abstract

We demonstrate the complete, rapid, and reversible switching between the emissions from two electrogenerated chemiluminescence (ECL) systems contained within the same solution, controlled by simple modification of the applied potential. The fundamental bases of the approach are the ability to selectively ‘switch on’ luminophores at distinct oxidation potentials, and an intriguing observation that the emission from the well-known electrochemiluminescent complex, fac-Ir(ppy)3, (where ppy is 2-phenylpyridinato), can be selectively ‘switched-off’ at high overpotentials. The dependence of this phenomenon on high concentrations of the co-reactant implicates quenching of the excited [Ir(ppy)3]* state by electron transfer. Rapid spectral scanning during modulation of the applied potential reveals well resolved maxima for mixtures comprising either green and red or green and blue luminophores, illustrating the vast potential of this approach for multiplexed ECL detection.

Graphical abstract: A potential-controlled switch on/off mechanism for selective excitation in mixed electrochemiluminescent systems

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Publication details

The article was received on 09 Oct 2012, accepted on 25 Nov 2012 and first published on 26 Nov 2012


Article type: Edge Article
DOI: 10.1039/C2SC21707D
Citation: Chem. Sci., 2013,4, 977-982
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    A potential-controlled switch on/off mechanism for selective excitation in mixed electrochemiluminescent systems

    E. H. Doeven, E. M. Zammit, G. J. Barbante, P. S. Francis, N. W. Barnett and C. F. Hogan, Chem. Sci., 2013, 4, 977
    DOI: 10.1039/C2SC21707D

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