20 August 2009 Photophysical and photoconductive properties of organic semiconductor composites
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We report on the effects of introducing guest molecules into a functionalized anthradithiophene (ADT) host on the photoluminescent (PL) and photoconductive properties of solution-deposited thin films. An addition of 0.1 wt % of an ADT derivative with cyano end groups (ADT-TIPS-CN) to a fluorinated ADT derivative (ADT-TES-F) resulted in the near complete quenching of the fluorescence spectrum of the ADT-TES-F host with an enhancement in the fluorescence spectrum of the ADT-TIPS-CN guest. A markedly longer PL lifetime was noted in films containing 10% ADT-TIPS-CN guest molecules compared to both pristine ADT-TES-F and ADT-TIPS-CN films. Stronger temperature dependence of the PL quantum yield was obtained in ADT-TIPSCN/ ADT-TES-F films at low ADT-TIPS-CN concentrations than in films of pristine material, with PL decreasing with increasing temperature. Significant changes in the photoexcited charge carrier dynamics were observed on nanosecond time-scales after 400 nm 100 fs pulsed photoexcitation upon adding ADT-TIPS-CN guest molecules to the ADT-TES-F host. In contrast, no considerable change in the photocurrent was detected under continuous wave 532 nm excitation for guest molecule concetrations up to 1% of ADT-TIPS-CN in ADT-TES-F.
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Andrew D. Platt, Whitney E. B. Shepherd, John E. Anthony, Oksana Ostroverkhova, "Photophysical and photoconductive properties of organic semiconductor composites", Proc. SPIE 7413, Linear and Nonlinear Optics of Organic Materials IX, 74130S (20 August 2009); doi: 10.1117/12.826634; https://doi.org/10.1117/12.826634

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