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首页> 外文期刊>RSC Advances >Bipolar pi-conjugation interrupted host polymers by metal-free superacid-catalyzed polymerization for single-layer electrophosphorescent diodes
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Bipolar pi-conjugation interrupted host polymers by metal-free superacid-catalyzed polymerization for single-layer electrophosphorescent diodes

机译：单层电致磷光二极管的无金属超强酸催化双极性π共轭中断了主体聚合物

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摘要

Novel aromatic bipolar host polymers (P1 and P2) containing pyridine as an electron transporting unit and carbazole and fluorene as hole transporting units in the pi-conjugation interrupted polymer backbone have been synthesized by a metal-free superacid-catalyzed polyhydroxyalkylation. The present polymers show good thermal stability, with high glass transition temperatures and decomposition temperatures. The conjugation lengths of the polymers are effectively confined into the repeating units due to the delta-C bond interrupted polymer backbone, giving rise to quite high triplet energy (2.79 eV for P1) and a wide band gap of around 3.33 eV, which make them promising hosts for phosphorescent OLEDs. The results suggest that the strategy of incorporating bipolar blocks into the p-conjugation interrupted polymer backbone can be a promising approach to obtain host polymers with high triplet level for green and even blue phosphorescent polymer light-emitting diodes on a simple device structure and using a solution-processed technique.
机译：通过无金属的超酸催化的多羟基烷基化反应，合成了新型的芳香族双极性主体聚合物（P1和P2），其在π结合中断的聚合物主链中包含吡啶作为电子传输单元，咔唑和芴作为空穴传输单元。本发明的聚合物表现出良好的热稳定性，具有高的玻璃化转变温度和分解温度。由于δ-C键中断了聚合物主链，聚合物的共轭长度有效地限制在重复单元内，从而产生了很高的三重态能量（P1为2.79 eV）和约3.33 eV的宽带隙，这使它们磷光OLED的有希望的宿主。结果表明，将双极嵌段结合到p共轭中断的聚合物主链中的策略可能是一种有前途的方法，可在简单的器件结构上使用绿色和蓝色磷光聚合物发光二极管获得具有高三线态能级的主体聚合物，并使用固溶处理技术。

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