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 18.17: Poster

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

Nanostructures to Enhance Light Extraction from OLEDs — •Julian Hauß, Sebastian Gleiß, Ulf Geyer, Boris Riedel, Uli Lemmer, and Martina Gerken — Lichttechnisches Institut, Universität Karlsruhe, D-76131 Karlsruhe, Germany

In current organic light emitting diodes (OLEDs) only a small fraction of the generated photons can be extracted as useful light (5-20%). Besides quenching and substrate modes, guided modes in the organic layers and surface plasmons at the metal-organic interface are the main loss channels. The outcoupling of substrate modes is widely studied and established in common devices whereas for the outcoupling of guided modes and plasmons a general remedy is still lacking. We study the angular and spectral dependence of the emitted light and the ability to tailor these properties by periodic nanostructures, which scatter guided modes and surface plasmons. The investigated structures are fabricated by interference lithography, which is a promising approach to large scale and cost effective production. The experimental results are compared to numerical simulations.