The room temperature near-infrared electroluminescence(EL) was observed from organic EL devices using the ytterbium(III) [Yb(III)] complex as an emitter over 15 V, though there was no spectral overlap between the lowest triplet state of ligand and the emissive level of Yb(III) ion needed for the intramolecular energy transfer. The EL emission with a peak at 985 nm was assigned to the 2F5/2 → 2F7/2 transition of Yb(III) ion.
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Kawamura et al. (2000) studied this question.
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