Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.28: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Hybridization and Charge Transfer of Planar Pt(II) Triplet Emitters at the metal organic Interface — •Alexander Timmer, Pascal Raphael Ewen, Jan Sanning, Chistian Alejandro Srassert, Daniel Wegner, Harry Mönig, and Harald Fuchs — Physikalisches Institut, Westfälische- Wilhelms Universität Münster, Deutschland

The physical and chemical properties of organic molecules on surfaces are strongly influenced by the coupling mechanisms involved. We examined the electronic structure and the adsorption behavior of the interfaces formed between electroluminescent Pt(II) complexes and various metal surfaces using photoelectron spectroscopy (PES) and scanning tunneling microscopy (STM). Furthermore we performed PES measurements on multilayer structures of these Pt(II) complexes to gain information about energy level alignment and possible charge transfer processes in stacks of such planar triplet emitters. In addition we methodically changed the substituent of the organo-metallic complexes, which in essence varied the adsorbate substrate distance, or in case of the multilayer structures alters the intermolecular stacking distance, respectively. Our results may provide further insight into the coupling and hybridization mechanisms of these molecular systems with electrodes, which are essential for the design of electroluminescent devices, such as organic light emitting diodes (OLEDs) or light emitting electrochemical cells (LEECs).