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Issue 11, 2010
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White electroluminescence of lanthanide complexes resulting from exciplex formation

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Abstract

Bimetallic complexes of the visible-emitting Eu3+, Tb3+ and Sm3+ ions with 2,2′-bipyrimidine (bpm) and acetylacetonate (acac) ligands have been synthesized and crystallographically characterized. They have been found to be isomorphous with the general formula [{Ln(acac)3}2(μ-bpm)] (Ln = Eu, 1; Ln = Tb, 2; Ln = Sm, 3). Their X-ray crystal structure shows that the aromatic polyamine ligand bridges the two metal ions. These volatile complexes have been thermally evaporated to be introduced in multilayer OLEDs as dopants. In addition to the electroluminescence of the lanthanide ion, a broad emission in the yellow-green region was obtained. This resulted in white electroluminescence of the devices doped with 1 or [{Eu(tta)3}2(μ-bpm)] (4) complexes (tta = 2-thenoyltrifluoromethanesulfonato). This broad emission is shown to be caused by the formation of an exciplex between the dopant and the host matrix within the emitting layer of the devices.

Graphical abstract: White electroluminescence of lanthanide complexes resulting from exciplex formation

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Publication details

The article was received on 20 Oct 2009, accepted on 11 Dec 2009, published on 28 Jan 2010 and first published online on 28 Jan 2010


Article type: Paper
DOI: 10.1039/B921740A
Citation: J. Mater. Chem., 2010,20, 2114-2120
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    White electroluminescence of lanthanide complexes resulting from exciplex formation

    G. Zucchi, T. Jeon, D. Tondelier, D. Aldakov, P. Thuéry, M. Ephritikhine and B. Geffroy, J. Mater. Chem., 2010, 20, 2114
    DOI: 10.1039/B921740A

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