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20 August 2009 Triindole based single crystals and thin films for OLED and OFET applications
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The search of new organic molecules with improved properties is of fundamental relevance for hybrid organic-inorganic based devices (OLED, FET, PV, injection layers, flexible large area devices, lasers, etc.). Triindole based materials present extended aromatic cores with disk-like geometry that allow tailoring their electronic properties through chemical functionalization. In this work we present an optical and electronic study of new triindole based single crystals. Pistacking gives rise to highly ordered columnar structures yielding to high mobilities, around 0.4 cm2V-1s-1. External oxidation is found to increase orders of magnitude the conductivity. Slight modifications of this platform modify substantially the crystallization dynamics and therefore the quality of the thin films obtained by spin coating from solutions with different solvents. The morphology, stability and properties of the optimized films are found to be promising for device fabrication. A comparative study of the absorption and emission efficiency of solutions and thin films of the different derivatives is presented. The first tests for OLED and OFET devices are under way.
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E. M. García-Frutos, C. Coya, A. de Andrés, R. Ramírez, R. Ramírez, P. de Andrés, E. Gutierrez-Puebla, A. Monge, and B. Gómez-Lor "Triindole based single crystals and thin films for OLED and OFET applications", Proc. SPIE 7417, Organic Field-Effect Transistors VIII, 741706 (20 August 2009);

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