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Electroluminescent devices from ionic transition metal complexes (iTMCs) are attractive candidates for display and lighting applications. A major limitation of application of iTMC devices is their turn-on times, which range from minutes to hours at 3 V. We report novel ruthenium and iridium complexes with pendant triethylammonium groups bonded to the ligands with methylene units of various lengths. These materials lead to devices with turn-on times at 3 V as short as 2.5 min for the iridium complexes and as low as 5 s for the ruthenium complexes.
Zysman‐Colman et al. (2007) studied this question.