Abstract
Thermal annealing effects on organic light-emitting field-effect transistor (OLEFET) characteristics of a liquid crystalline π-conjugated polymer were investigated using spin-coated films of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-bithiophenione] (F8T2). Well-balanced ambipolar carrier injection was attained in the homogeneous polycrystalline film grown from the isotropic phase at 350 °C, resulting in the highest light emission under AC-gate operation. On the other hand, the film with microcrystalline grains quenched from the nematic phase at 290 °C was less electron-transporting so that the light emission intensity was lower than the amorphous film annealed at 250 °C.
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