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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: POSTERS Electronic and Optical Properties

CPP 40.15: Poster

Donnerstag, 26. März 2009, 17:00–19:30, P3

The role of exciplexes in phoshorescent host-guest systems — •Bianca Höfer¹, Manuel Thesen², Hartmut Krüger², Silvia Janietz², and Anna Köhler¹ — ¹Department of Physics, University of Bayreuth, 95440 Bayreuth, Germany — ²Fraunhofer Institute of Applied Polymer Research, 14476 Potsdam, Germany

Efficient organic white light emitting diodes (OLEDs) can be produced using several organometallic phosphorescent dyes embedded in an organic matrix. We recently demonstrated that steric shielding can be employed to avoid cascading energy transfer from blue to red emitting dyes in a blend of Ir-complexes using polymeric oxadiazole- and triphenylamine-derivatives as electron and hole transporting materials.* Here we investigate the dynamics of energy transfer between the emissive dyes and the host materials. We address the issue how non-emissive exciplexes in the host materials may control the efficiency of the white OLEDs.