Abstract
It is demonstrated that oxide-bound terbium(III) at an aluminium electrode surface can be excited electrochemically to its lowest singlet state in aqueous electrolytes. The relaxation of this excited state to the vibrational ground states induces the well known narrow-band terbium(III) emissions at the peak wavelengths of 489, 548, 586 and 620 nm. In the presence of hydrogen peroxide and potassium peroxodisulphate, this cathodic electrogenerated luminescence (EL) can be used to produce an analytically feasible response for terbium(III) cation in aqueous solutions even at the 10 −8 M level. A detailed reaction scheme is presented for this cathodic terbium(III) EL and its utilization as an EL-based probe for environmental and clinical trace analysis is proposed.
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