Photophysical and Photoconductive Properties of Novel Organic Semiconductors

Optical, fluorescent, and photoconductive properties of novel functionalized anthradithiophene (ADT), pentacene, and dicyanomethylenedihydrofuran (DCDHF) derivatives are presented. Fast charge carrier photogeneration and high photoconductive gains were observed in solution-deposited films. By creating mixtures of various derivatives, different charge carrier dynamics could be achieved at ps-mu s time-scales after 100-fs pulsed photoexcitation. In most derivatives, high fluorescent quantum yields (QYs) of 70-85% were observed in solutions. In fluorinated ADT films, QYs were at least 40-50% at room temperature and decreased by a factor of 3-5 as the temperature increased from 20 degrees C to 80 degrees C.