Herein, a novel core molecule for V-shaped host molecules was synthesized, wherein two carbazoles were directly linked to cyclohexane. Cy-mCP and Cy-mCBP hosts were also successfully prepared for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF–OLEDs). The Cy-mCP and Cy-mCBP molecules contained a cyclohexane linker directly linked to two small molecular hosts (mCP and mCBP), exhibiting twice the molecular weight while maintaining the basic properties of a single host molecule with improved film-forming ability and solubility in organic solvents. These host materials showed superior thermal stability and high glass transition temperatures compared to lower molecular weight hosts. Green TADF–OLEDs were prepared using the two host materials and 2,4,5,6-tetra(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene (t4CzIPN) emitter, achieving device efficiencies similar to that of a low-molecular-weight host. However, after the incorporation of a V-shaped host, superior characteristics were observed in terms of the thermal stability and operational stability of the device. The synthesis of V-shaped molecules by directly linking two carbazoles to a cyclohexane linker is promising for the development of different hosts for solution-processable OLEDs.

中文翻译：

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适用于溶液加工的热激活延迟荧光 OLED 主体材料的合理分子设计策略

在此，合成了一种用于 V 形主体分子的新型核心分子，其中两个咔唑直接连接到环己烷上。Cy-mCP和Cy-mCBP宿主也成功制备用于可溶液加工的热激活延迟荧光有机发光二极管 (TADF–OLED)。Cy -mCP和Cy-mCBP分子包含直接连接到两个小分子主体（mCP 和 mCBP）的环己烷接头，在保持单个主体分子的基本特性的同时，具有提高的成膜能力和在有机溶剂中的溶解度，从而表现出两倍的分子量。与较低分子量的主体相比，这些主体材料显示出优异的热稳定性和高玻璃化转变温度。使用两种主体材料和 2,4,5,6-tetra(3,6- ditert)制备绿色 TADF-OLED-butylcarbazol-9-yl)-1,3-dicyanobenzene (t4CzIPN) 发射体，实现与低分子量主体相似的器件效率。然而，在加入 V 形主体后，在器件的热稳定性和操作稳定性方面观察到了优异的特性。通过将两个咔唑直接连接到环己烷连接体上合成 V 形分子有望用于开发可溶液加工的 OLED 的不同主体。