Ultraweak emission of the Eu(III) ions in cathodic generated electrochemiluminescence

作者：Staninski K; Lis S^*

来源：Optical Materials, 2011, 33(10): 1540-1543.

DOI：10.1016/j.optmat.2011.03.019

• Electrochemiluminescence
• Europium (III) complexes
• Radical excitation

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.

• 出版日期2011-8