Hamburg 2001 – wissenschaftliches Programm
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SYOF: Organische Festkörper
SYOF 1: Organic Semiconductor Devices
SYOF 1.2: Vortrag
Dienstag, 27. März 2001, 10:10–10:25, S6
Efficient Organic Light-Emitting Diodes Based on Crosslinked Layers — •David Mueller1, Markus Gross1, Holger Frohne1, Klaus Meerholz1, Thomas Braig2, and Oskar Nuyken2 — 1Physical Chemistry Dept., University of Munich, Butenandtstr. 11, 81377 Munich — 2Makromolecular Chemistry, Technical University Munich, Lichtenbergstr. 4, 85747 Garching
The use of electrically semiconducting polymer networks obtained by crosslinking oxetane-functionalized monomers in organic light- emitting diodes was studied. The crosslinked films were found to be absolutely insoluble, enabling the preparation of organic heterostructures with an arbitrary number of layers by solution casting only. Layer-by-layer deposition did not lead to internal barriers for charge carriers. Co-polymerization of different monomers was demonstrated, allowing the simple tuning of electrical and optical properties. Highly-efficient blue light- emitting diodes (2.7 Cd/A at 1000 Cd/m2), consisting of a graded hole-transport layer with three electronic levels and a polyfluorene emissive layer, were fabricated [CPC 1(4), 2000]. We will discuss the chemical and morphological stability of the layers under high current throughput and the optimization of the individual layers by a combinatorial approach.