Ni Mingjian, Zhuo Zhiqiang, Liu Bin, Han Xu, Yang Jing, Sun Lili, Yang Yuekuan, Cai Jiangli, An Xiang, Bai Lubing, Xu Man, Lin Jinyi, Feng Quanyou, Xie Guohua, Wu Yutong, Huang Wei
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, China.
The Institute of Flexible Electronics (IFE, Future Technologies), Xiamen University, Xiamen, China.
Nat Commun. 2025 Jan 2;16(1):330. doi: 10.1038/s41467-024-55494-2.
Fully π-conjugated polymers consisting of plane and rigid aromatic units present a fantastic optoelectronic property, a promising candidate for printed and flexible optoelectronic devices. However, obtaining high-performance conjugated polymers with an excellent intrinsically flexible and printable capacity is a great challenge due to their inherent coffee-ring effect and brittle properties. Here, we report an asymmetric substitution strategy to improve the printable and stretchable properties of deep-blue light-emitting conjugated polymers with a strong inter-aggregate capillary interaction for flexible printed polymer light-emitting diodes. The loose rod-shaped stacking of asymmetric conjugated polymers chain in the precursor printed ink makes it easier to improve the intrinsic stretchability of inkjet-printed films. More interestingly, the anisotropic shape rod-like aggregate of conjugated polymers chains also induced a strong capillary interaction and further suppressed the coffee-ring effect, which is more likely to allow for uniform deposition during printed processing and form uniform printed films.
由平面且刚性的芳香单元组成的全π共轭聚合物具有出色的光电性能，是印刷和柔性光电器件的一个有前途的候选材料。然而，由于其固有的咖啡环效应和脆性，获得具有优异的固有柔性和可印刷能力的高性能共轭聚合物是一个巨大的挑战。在此，我们报道了一种不对称取代策略，以改善深蓝色发光共轭聚合物的可印刷和可拉伸性能，该聚合物具有用于柔性印刷聚合物发光二极管的强聚集体间毛细作用。前体印刷油墨中不对称共轭聚合物链的松散棒状堆积使得更容易提高喷墨印刷薄膜的固有拉伸性。更有趣的是，共轭聚合物链的各向异性形状棒状聚集体还诱导了强毛细作用，并进一步抑制了咖啡环效应，这更有可能在印刷过程中实现均匀沉积并形成均匀的印刷薄膜。
