Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.38: Poster
Montag, 14. März 2011, 17:30–19:30, P2
A High Gain and High Charge Carrier Mobility Indenofluorene-Phenanthrene Copolymer for Light Amplification and Organic Lasing — •Hun Kim1, Niels Schulte2, Gang Zhou1, Klaus Müllen1, and Frédéric Laquai1 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Merck KGaA - Dept. OLED PC/CP, Frankfurt am Main, Germany
The combination of excellent luminescence properties, high chromophore density and partially high charge carrier mobility makes conjugated polymers suitable candidates for optically and electrically pumped light amplifiers and organic lasers. In this contribution we introduce a novel class of copolymers based on the poly(indenofluorene) backbone and investigate their photophysical as well as optoelectronic device properties. In particular, we used time-resolved optical spectroscopy to study their excited state energies and lifetimes as well as amplified spontaneous emission (ASE) characteristics in slab waveguide structures. Charge carrier mobilities were investigated by the time of flight (TOF) technique. All materials were additionally tested in organic light emitting diodes to characterize their electroluminescence efficiencies. We demonstrate that copolymers based on the poly(indenofluorene) backbone can achieve previously unprecedented gain values of about 155 cm−1 in combination with very high hole mobilities of up to 10−2 cm2/Vs and very high electroluminescence efficiencies. This makes them ideal materials for organic lasing.
[1] H. Kim, N. Schulte, G. Zhou, K. Müllen, F. Laquai, Adv. Mater., 2010, accepted