Dresden 2009 – wissenschaftliches Programm
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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.