Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Ultrafast Dynamics III
MO 22.8: Vortrag
Donnerstag, 13. März 2025, 12:45–13:00, HS XVI
Halide Modulated Excited States of Dinuclear Copper Complexes — •Daniel Marhöfer1, Clara Adam2, Anna Mauri3, Martin Nieger4, Olaf Fuhr5, Patrick Weis6, Gereon Niedner-Schatteburg1, Wolfgang Wenzel3, and Stefan Bräse2 — 1Department of Chemistry and State Research Center OPTIMAS, RPTU Kaiserslautern — 2Institute of Organic Chemistry (IOC), Karlsruhe Institute of Technology (KIT) — 3Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) — 4Department of Chemistry, University of Helsinki — 5Karlsruhe Nano-Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT) — 6Institute of Biological and Chemical Systems, Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT)
Organic Light-Emitting-Diodes (OLEDs) are a key technology in state-of-the-art display applications, offering unparalleled efficiency and color purity. Copper as an earth-abundant metal shows promising characteristics regarding luminescence lifetimes and quantum yields. However, energy efficiency necessitates quantum yields close to 100 % as e.g. achievable through Thermally Activated Delayed Fluorescence (TADF). We investigated by luminescence, time-correlated single photon counting and step-scan FTIR spectroscopy a series of five isostructural, dinuclear copper complexes. Variation of the two (pseudo-)halide ligands modulates excited state lifetimes and luminescence patterns. Our interpretation of the TADF behaviour revealed significant variations of the singlet-triplet gap, beyond obvious trends. Quantum chemical modelling partly challenges these findings.
Keywords: TADF; copper complexes; step-scan FTIR; luminescence; OLED