Abstract
Electrogenerated chemiluminescence (ECL) studies have been performed for the iridium(III) cyclometalated L 2Ir(acac) complexes with substituted 2-phenylbenzothiazole ligand L. Electron transfer (ET) generation of the excited 3*L 2Ir(acac) has been studied using a triple-potential-step technique in acetonitrile–dioxane (1:1) solutions containing 0.1 M ( n-C 4H 9) 4NPF 6 as the supporting electrolyte. ET reactions between electrochemically generated L 2Ir(acac) + and A − (radical anions of aromatic nitriles) species lead to very efficient generation of ECL emission. Extremely high ECL efficiencies (up to 0.40) close to the excited 3*L 2Ir(acac) luminescence yields have been found.
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