Regensburg 2002 – wissenschaftliches Programm
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SYOH: Organische Halbleiter
SYOH 7: Poster
SYOH 7.44: Poster
Montag, 11. März 2002, 18:00–21:00, C
Electroluminescence from Polymer-Nanosphere Layers — •Thomas Kietzke1, Dieter Neher1, Katharina Landfester2, Rivelino Montenegro2, Ullrich Scherf3, Roland Guentner3, Udom Asawapirom3, and Satish Patil3 — 1University of Potsdam, Institute of Physics, Am Neuen Palais 10, D-14469 Potsdam — 2Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 — 3University of Potsdam, Institute of Physical Chemistry, Karl-Liebknecht-Str. 24/25, Haus 25, D-14476 Golm
A novel approach to deposit nanopheres of semiconducting polymers from aqueous liquids is presented. Nanoparticles of several polymers (LPPP, PPV, PF) dispersed in water have been produced via the miniemulsion process. Homogenous layers of theses semiconducting nanopheres (SNP) were prepared by spin-coating the dispersion onto glass substrates. AFM studies showed that these layers exhibit a particle structure, revealing the shape of the individual nanoparticles. The influence of annealing on the layer morphology was investigated for different types of polymers with different Tg. To probe the electronic and optical properties, absorption and photoluminescent spectra of these novel layers were recorded. Comparison with data for the same polymer obtained for layers prepared from organic solvents showed no difference indicating that the electronic structure of the polymer remains unchanged upon particle formation. First organic light emitting devices (OLED) containing semiconducting nanopheres were fabricated and their characteristics are compared with those prepared via conventional deposition of the polymer layer from organic solvents.