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We explore the photophysical, electrochemical, and electroluminescent properties of the ionic transition metal complex [(ppy)2Ir(bpy*)](PF6) where ppyH is 2-phenylpyridine and bpy* is 5,5′-diaryl-2,2′-bipyridine. Single layer devices of the structure ITO/[(ppy)2Ir(bpy*)](PF6)/Au exhibited high stability, with half-lives on the order of 100 h at a bias of −4 V. Long lifetimes are achieved through the bulky nature of the aryl substituents, which serves to limit chromophore–chromophore self-quenching, and 5,5′ positioning of these bulky groups is clearly advantageous for device performance.
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