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20 August 2009 Optical and electronic properties of functionalized pentacene and anthradithiophene derivatives
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The optical, fluorescent, and photoconductive properties of solution-processable functionalized pentacene and anthradithiophene (ADT) derivatives are presented. Considerable fluorescence quantum yields of - 70-75% and ~ 40-50% were observed in several ADT derivatives in toluene solutions and in thin films, respectively. Using conventional wide-field fluorescence microscopy, ADT derivatives were successfully imaged in the polymethylmethacrylate (PMMA) matrix on a single molecule level, at 532 nm at room temperature. All films exhibited fast charge carrier photogeneration upon 100 fs 400 nm excitation and power-law decay dynamics of the transient photocurrent over many orders of magnitude in time. In solution-deposited ADT thin films, effective charge carrier mobilities calculated from the space-charge-limited currents reached ~ 0.1 cm2/Vs. In the same films, bulk photoconductive gains of up to 130 were observed at 532 nm continuous wave (cw) excitation with light intensity of 0.58 mW/cm2 at the applied electric field of 4 × 104 V/cm. Effects of metal-organic interfaces on the dark current and transient and cw photocurrent are also discussed.
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Oksana Ostroverkhova, Andrew D. Platt, Whitney E. B. Shepherd, Jonathan Day, and John E. Anthony "Optical and electronic properties of functionalized pentacene and anthradithiophene derivatives", Proc. SPIE 7413, Linear and Nonlinear Optics of Organic Materials IX, 74130A (20 August 2009);

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