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Issue 1, 2013
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A deep-blue emitting charged bis-cyclometallated iridium(III) complex for light-emitting electrochemical cells

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Abstract

We report here a new cationic bis-cyclometallated iridium(III) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2′,6′-difluoro-2,3′-bipyridine skeleton as the cyclometallating ligand and a bis-imidazolium carbene-type ancillary ligand. Furthermore, bulky tert-butyl substituents are used to limit the intermolecular interactions. LECs have been driven both at constant voltage (6 V) and constant current (2.5 mA cm−2). The performances are significantly improved with the latter method, resulting overall in one of the best reported greenish-blue LECs having fast response (17 s), light intensity over 100 cd m−2 and a reasonable efficiency of almost 5 cd A−1.

Graphical abstract: A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells

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Publication details

The article was received on 21 Sep 2012, accepted on 23 Oct 2012 and first published on 23 Oct 2012


Article type: Paper
DOI: 10.1039/C2TC00251E
Citation: J. Mater. Chem. C, 2013,1, 58-68
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    A deep-blue emitting charged bis-cyclometallated iridium(III) complex for light-emitting electrochemical cells

    S. B. Meier, W. Sarfert, J. M. Junquera-Hernández, M. Delgado, D. Tordera, E. Ortí, H. J. Bolink, F. Kessler, R. Scopelliti, M. Grätzel, M. K. Nazeeruddin and E. Baranoff, J. Mater. Chem. C, 2013, 1, 58
    DOI: 10.1039/C2TC00251E

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