Near-infrared electroluminescence of polymer light-emitting diodes doped with a lissamine-sensitized Nd3+ complex

L.H. Slooff, A. Polman, F Cacialli, R.H. Friend, G.A. Hebbink, F.C.J.M. van Veggel, David Reinhoudt

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    145 Citations (Scopus)

    Abstract

    We report 890 nm luminescence from a neodymium-doped polymer light-emitting diode. The active layer is a blend of poly(dioctylfluorene-co-benzothiadiazole), F8BT, and a lissamine-functionalized terphenyl-based neodymium complex. We detect electroluminescence from both the lissamine (580 nm) and the Nd3 + complex (890 nm). By comparison with lissamine-free devices we show that the lissamine is crucial to infrared emission. The neodymium/lissamine luminescence intensity ratio is higher under electrical excitation than under optical excitation, showing that more triplets reach Nd3 + under electrical excitation. High turn-on voltages provide a clear indication for charge trapping onto the lissamine, and we consider direct triplet formation on the lissamine to be competing efficiently with respect to slower Dexter-type triplet transfer from the F8BT to the lissamine.
    Original languageUndefined
    Pages (from-to)2122-2124
    JournalApplied physics letters
    Volume78
    Issue number15
    DOIs
    Publication statusPublished - 2001

    Keywords

    • METIS-202380
    • IR-36568

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