Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Organic Semiconductors: Transistors and OLEDS

HL 85.7: Talk

Thursday, March 29, 2012, 16:45–17:00, EW 203

Extraction of trapped modes in organic light-emitting diodes via high-index coupling — •Bert Jürgen Scholz, Jörg Frischeisen, and Wolfgang Brütting — Institute of Physics, University of Augsburg, Germany

The efficiency of organic light-emitting diodes (OLEDs) is still limited by poor light outcoupling efficiency. In particular, the excitation of wave-guided modes in the organic layers and surface plasmon polaritons at metal-organic interfaces represent major loss channels.
By combining optical simulations and experiments on simplified luminescent thin-film structures we elaborate the conditions for the extraction of surface plasmons via coupling to high-index media. As a proof-of-concept, we demonstrate the possibility to extract light from wave-guided modes and surface plasmons usually trapped in the OLED by a high-index prism.