Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.23: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV
Time resolved XAS of Gaq3 at new PetraIII beamline P11 — •Benjamin Dicke1, Dennis Goeries1, Moritz Schlie2, Alke Meents1, and Edgar Weckert1 — 1Deutsches Elektronen Synchrotron (Desy) - Hasylab, Notkestrasse 85, D-22607 Hamburg, Germany — 2Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
Metalorganic compounds such as tris(8-hydroxyquinoline) gallium (Gaq3) are promising materials for the emission layer of Organic light emitting diodes (OLEDs) due to their specific electro- and photoluminescent properties. Many studies have been done to understand the mechanisms of electroluminscence in order to develope new emitter materials and thus optimized OLEDs with higher efficiency. Nevertheless the excited state structure remains unknown. To determine the excited state structure of metalorganic compounds a setup for time resolved X-ray absorption spectroscopy (XAS) has been developed. The compound in solution-phase is passed through a nozzle of 30 um diameter to form a free-standing micro-jet. A pulsed laser which is synchronized to the synchrotron is focused on the micro-jet and excites the flowing molecules. The X-ray is directed on the jet so that X-ray focus and laser focus are overlapping. In this way the excited states of the molecules are probed. We show first results towards time resolved XAS of Gaq3.