Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Organic Electronics and Photovoltaics (jointly with CPP, DS, HL)

O 54.3: Talk

Wednesday, March 13, 2013, 16:30–16:45, H33

Investigation of the electronic structure of phosphorescent Platinum(II) complexes on Au(111) by STM and STS — •Pascal Raphael Ewen, Hasmik Harutyunyan, Jan Sanning, Matteo Mauro, Cristian Alejandro Strassert, and Daniel Wegner — Physikalisches Institut - Westfälische Wilhelms Universität Münster

Quenching effects still limit the efficiency of state-of-the-art organic light emitting diodes (OLEDs) at higher doping concentrations of the triplet emitter molecules within the emission layer. A possible candidate for avoiding of the loss of luminescence are recently synthesized Pt(II) complexes that do not show quenching even when aggregated into fibers or gels. The efficient implementation of such complexes in electronic devices requires a fundamental understanding of the interaction of the molecules with the local environment. A systematic investigation of the adsorption and the electronic structure of slightly different phosphorescent Pt(II) complexes offers information about the influence of ligands and substituents on the complexes as well as their interactions with neighbours and the substrate. We have studied the impact of molecule-surface and intermolecular interactions on the self-assembly and electronic structure of Pt-complex monolayers on Au(111) using scanning tunneling microscopy (STM) and spectroscopy (STS) at low temperature. By determining energies and spatial distributions of several frontier orbitals, we are able to evaluate the impact of hybridization on the molecular electronic structure with important consequences for the optical properties.