Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations

CPP 50.12: Poster

Wednesday, March 22, 2017, 18:30–21:00, P3

Influencing emitter orientation in solution processed guest-host-sytems — •Philippe Linsmayer, Thomas Lampe, and Wolfgang Brütting — Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

The beneficial horizontal alignment of the transition dipole moments in heteroleptic Ir-complexes is dominated by the interaction at the aromatic film surface during the step-by-step layer deposition in thermally evaporated films. In order to probe weaker molecular interactions besides these effects, we studied phosphor alignment in solution processed guest-host systems. While this approach is not giving the possibility for horizontal alignment of the transition dipole moments, it reveals the influence of the processing parameters like dopant concentration, glass-transition temperature of the host and impact of thermal annealing in solution processed films. For the experiments a common heteroleptic Ir-complex was doped into four different host materials with varying glass transition temperatures. After deposition the films were treated with thermal annealing near the glass transition temperature. The results indicate dependence of the resultant emitter orientation on several parameters which can be attributed to different molecular interactions inside the guest-host system.