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Issue 44, 2011
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High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5′ substituents

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Abstract

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 chromophorechromophore self-quenching, and 5,5′ positioning of these bulky groups is clearly advantageous for device performance.

Graphical abstract: High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5′ substituents

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Publication details

The article was received on 28 Jun 2011, accepted on 26 Sep 2011 and first published on 13 Oct 2011


Article type: Paper
DOI: 10.1039/C1JM12984H
Citation: J. Mater. Chem., 2011,21, 18083-18088
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    High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5′ substituents

    L. Sun, A. Galan, S. Ladouceur, J. D. Slinker and E. Zysman-Colman, J. Mater. Chem., 2011, 21, 18083
    DOI: 10.1039/C1JM12984H

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