Determining absolute electrochemiluminescence efficiencies of two iridium complexes

Liuqing Yang, Jonathan R. Adsetts, Ruizhong Zhang, Barbora Balónová, Marta T. Piqueras, Kenneth Chu, Congyang Zhang, Eli Zysman-Colman, Barry A. Blight, Zhifeng Ding

Research output: Contribution to journalArticlepeer-review


This work reports absolute electrochemiluminescence (ECL) quantum efficiencies (QEs) of two iridium(III) complexes, fac-Ir(ppy)3 (Ir-1) and [Ir(ppy)2(dtbubpy)]+ ([Ir-2]+) in annihilation and coreactant pathways. With potentiodynamic scans and potential pulsing, ECL mechanisms were investigated by means of ECL-voltage curves, ECL-time curves and ECL spectroscopy. It was demonstrated that the radical stability and reactivity are the two main factors affecting ECL efficiencies in various processes, while intermediate charges have little effect. Considering the difference of such radical behaviors between [Ru(bpy)3]2+ and other luminophores, absolute ECL QEs are more applicable compared with the ones relative to [Ru(bpy)3]2+ as a standard.
Original languageEnglish
Article number115891
JournalJournal of Electroanalytical Chemistry
VolumeIn press
Early online date19 Nov 2021
Publication statusE-pub ahead of print - 19 Nov 2021


  • Iridium(III) complexes
  • Electrochemiluminescence
  • Absolute and relative quantum efficiency
  • Radical stability
  • Radical reactivity


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