Triphenylamine Spirofunctionalized Light‐Emitting Conjugated Polymer with an Ultradeep‐Blue Narrowband Emission for Large‐Area Printed Display

作者：Mengyuan Li, Yahui Zhang, Ningning Yu, Wenyu Chen, Huaqiang Gong, Yingying Zheng, Mingjian Ni, Yamin Han, Ning Sun, Lubing Bai, Xiang An, Jing Yang, Yingru Lin, Wenxin Huang, Wenxin Huang, Zhiqiang Zhuo, Xinyu Liang, Lizhi Wang, Lili Sun, Man Xu, Jinyi Lin, Wei Huang, Wei Huang · 发表于：Advanced Materials · 年份：2024 · DOI：10.1002/adma.202307605 · 被引用次数：7 · 研究领域：Organic Light-Emitting Diodes Research、Organic Electronics and Photovoltaics、Conducting polymers and applications

Abstract Emerging printed large‐area polymer light‐emitting diodes (PLEDs) are essential for manufacturing flat‐panel displays and solid lighting devices. However, it is challenging to obtain large‐area and stable ultradeep‐blue PLEDs because of the lack of light‐emitting conjugated polymers (LCPs) with robust deep‐blue emissions, excellent morphological stabilities, and high charging abilities. Here, a novel unsymmetrically substituted polydiarylfluorene (POPSAF) is obtained with stable narrowband emission for large‐area printed displays via triphenylamine (TPA) spirofunctionalization of LCPs. POPSAF films show narrowband and stable ultradeep‐blue emission with a full width at half maximum (FWHM) of 36 nm, associated with their intrachain excitonic behavior without obvious polaron formation. Compared to controlled poly[4‐(octyloxy)‐9,9‐diphenylfluoren‐2,7‐diyl]‐co‐[5‐(octyloxy)‐9,9‐diphenylfluoren‐2,7‐diyl] (PODPF), excellent charge transport is observed in the POPSAF films because of the intrinsic hole transport ability of the TPA units. Large‐area PLEDs are fabricated via blade‐coating with an emission area of 9 cm 2 , which exhibit uniform ultradeep‐blue emission with an FWHM of 36 nm and corresponding Commission internationale de l’éclairage (CIE) coordinates of (0.155, 0.072). These findings are attributed to the synergistic effects of robust emission, stable morphology, and printing capacity. Finally, preliminary printed passive matrix (PM) PLED displays with 20 × 20 p...