Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces

DS 18.14: Poster

Tuesday, February 26, 2008, 14:30–19:30, Poster A

Nanocolloidal Scattering Particles Integrated in OLEDs — •Boris Riedel, Julian Hauß, Sebastian Gleiß, Uli Lemmer, and Martina Gerken — Lichttechnisches Institut, Universität Karlsruhe (TH)

Organic light emitting devices (OLEDs) combine cost-effective fabrication with large device areas. While OLEDs are starting to appear in commercial displays, they are not sufficiently bright yet for lighting applications. In current OLEDs only about 20% of the generated photons can exit the device. The rest is trapped as surface plasmon polaritons or as guided modes inside the organic layers or the substrate. We investigate the influence of nanocolloidal scattering particles on the extraction efficiency of OLEDs. These particles inhibit internal guided modes inside the OLED and thus increase the amount of extracted light. We use SiO2 and ZnO dispersed in water and ethyl alcohol respectively and bring them onto the Indium Tin Oxide-anode. This modified substrate is then further processed by evaporating small molecules or by spincoating polymers. Fabricated devices are characterized electrically and optically.