Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 1: Photochemistry
MO 1.6: Talk
Monday, March 6, 2017, 16:00–16:15, N 6
Time-Resolved Step-Scan FTIR Investigations on Dinuclear Cu(I)-NHETPHOS-complexes — •Manuel Zimmer1, Fabian Dietrich1, Florian Bäppler1, Manuela Wallesch2, Daniel Volz3, Stefan Bräse2, Rolf Diller1, and Markus Gerhards1 — 1TU Kaiserslautern, 67663 Kaiserslautern — 2Karlsruhe Institute of Technology, 76131 Karlsruhe — 3CYNORA GmbH, 76646 Bruchsal
Time-resolved (TR) infrared experiments enable the investigation of chemical reactions, photochemical/-physical processes and their kinetic traces. With the step-scan technique we are able to identify electronically excited states and excited state structures by comparison with theoretical results from quantum chemical calculations. Here we present the first TR step-scan FTIR measurements on dimetallic Cu(I)-NHETPHOS-complexes in solid state (KBr matrix and thin film). These complexes, which are developed for emitter material in OLEDs, are a very promising substitute for currently used Ir-complexes. Time-resolved IR spectra of electronically excited states have been obtained by step-scan FTIR measurements and in addition, wavelength and temperature dependent measurements as well as femtosecond transient absorption and reflectivity measurements have been performed to gain detailed information about the excited state processes and deactivation mechanisms. The temperature dependent measurements down to 20 K provided valuable information to confirm the postulated thermally activated delayed fluorescence (TADF) mechanism at room temperature (RT). The interpretation of measured spectra succeeded in combination with quantum chemical calculations (DFT and TD-DFT).