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MO: Fachverband Molekülphysik
MO 15: MO Poster 3
MO 15.17: Poster
Wednesday, March 11, 2020, 17:00–19:00, Empore Lichthof
Efficient Ytterbium Near-Infrared Luminophore Based on a Nondeuterated Ligand — •Pariya Nazari1, Christian Kruck2, Carolin Dee2, Michael Seitz2, Ian Howard1,3, Bryce S. Richards1,3, and Andrey Turshatov1 — 1Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT) — 2Institute of Inorganic Chemistry, University of Tübingen — 3Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT)
Near-infrared lanthanoid(III) luminophores are highly interesting for technological applications such as biomedical imaging, and spectral conversion materials. The main challenge for the development of efficient, molecular, near-IR emitter complexes is the vibrational deactivation of metal-centered states by multiphonon relaxation where the energy is transferred from the lanthanoid to high-energy oscillators such as O-H and C-H in its vicinity. The two main strategies to alleviate the problem in the ligands are removing these oscillators by either deuteration or halogenation. While the development of deuterated/halogenated near-IR ytterbium luminophores has made great progress, there is still a need for molecular emitters that are relatively simple to prepare, yet still able to exhibit acceptable luminescence efficiency. In this study, we comprehensively characterize the photophysics of a novel molecular ytterbium complex with a new tetradentate ligand based on the 2,2-bipyridine-6,6-dicarboxylic acid scaffold. The ytterbium complex shows a rather high absolute luminescence quantum yield of 3.0% and a luminescence lifetime of 72 μs at room temperature in deuterated-methanol solution.