The importance of thermally activated delayed fluorescence (TADF) materials in organic light-emitting diode (OLED) applications continues to grow as a consequence of their unique properties and excellent performance. Herein, a new green-emitting TADF polymer, P(DMTRZ-Cp), for solution-processable OLEDs was designed and synthesized based on the structure of DMAC-TRZ that shows typical TADF characteristics as a small molecule. The 1,1-diphenylcyclohexane (Cp) moiety introduced into the structure of the polymeric emitter not only acts as a linker between the conjugated monomeric units, but also helps enhancing solubility while disconnecting conjugation along the polymer backbones. P(DMTRZ-Cp) exhibits obvious TADF features such as a small energy gap (0.023 eV) between its lowest singlet and triplet excited states, and obvious delayed photoluminescence (PL) decay behavior. Moreover, this new polymeric emitter exhibits high PL quantum yield over 90% in the film state. By applying solution-processed TADF-OLED devices, P(DMTRZ-Cp) exhibited the maximum external quantum efficiency of up to 15.4% with green emission. As far as we know, this is the first report to introduce a non-conjugated linker, Cp, in the main-chain type polymeric emitter structure that presents TADF characteristics. The Cp linker is considered to be a promising moiety for the development of solution-processable polymeric emitters with high efficiencies.

中文翻译：

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使用包含非共轭环己烷单元的新型聚合物发射体进行溶液处理的热活化延迟荧光有机发光二极管†

由于其独特的性能和出色的性能，热激活延迟荧光（TADF）材料在有机发光二极管（OLED）应用中的重要性不断提高。在本文中，基于DMAC-TRZ的结构设计并合成了一种新的绿色可发射TADF聚合物P（DMTRZ-Cp），该结构可显示出小分子的典型TADF特性。引入聚合物发射体结构中的1,1-二苯基环己烷（Cp）部分不仅充当共轭单体单元之间的连接基，而且有助于增强溶解性，同时断开沿聚合物主链的共轭作用。P（DMTRZ-Cp）表现出明显的TADF特征，例如，其最低单重态和三重态激发态之间的能隙较小（0.023 eV），并且具有明显的延迟光致发光（PL）衰减行为。此外，这种新型的聚合物发射体在薄膜状态下具有超过90％的高PL量子产率。通过应用溶液处理的TADF-OLED器件，P（DMTRZ-Cp）在绿色发射的情况下显示出高达15.4％的最大外部量子效率。据我们所知，这是第一个在具有TADF特性的主链型聚合物发射体结构中引入非共轭连接体Cp的报告。所述的Cp接头被认为是用于溶液处理的聚合物发射体的开发具有高效率有希望的部分。