Journal
OPTICAL MATERIALS
Volume 33, Issue 10, Pages 1540-1543Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2011.03.019
Keywords
Electrochemiluminescence; Europium (III) complexes; Radical excitation
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High voltage cathodic generated electrochemiluminescence (ECL) of selected systems generating weak photon emission was studied. The investigated systems contained europium salts, and co-reactants: H2O2 and K2S2O8. During the cathodic pulse polarization of an oxide-covered working aluminum electrode, hot electrons in metal may enter the conduction band of water through the oxide layer/solution interface and turn into hydrated electron after salvation. The ECL intensity and spectra was measured though a suitable cut-off filters, with a photon counting unit attached to a PC computer. On the basis of the analysis of the spectra in particular systems, emitters were identified and simplified scheme of the processes was proposed. The Eu(III)-specific electro generated luminescence is produced via several parallel mechanisms, which usually involve a type of the co-reactant, oxidation state changes of europium ions in aqueous solution and the influence of working electrode surface emission. (C) 2011 Elsevier B.V. All rights reserved.
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