Abstract
Three types of block copolymers consisting of polyfluorene and polytriarylamine with benzothiadiazole (BT) moiety are synthesized and characterized to evaluate the effect of chromophore location on electroluminescent performance. BT unit is incorporated at the junction of both blocks (BP 1) in the polytriarylamine block (BP 2) and in the polyfluorene block (BP 3). Electroluminescent device based on BP 1 exhibits the best performance. This result is reasonably explained by taking into consideration the difference of recombination probability in the phase-separated active layers.
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