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

Author:

Li Mengyuan1,Zhang Yahui1,Yu Ningning1,Chen Wenyu1,Gong Huaqiang1,Zheng Yingying1,Ni Mingjian1,Han Yamin1,Sun Ning1,Bai Lubing1,An Xiang1,Yang Jing1,Lin Yingru1,Huang Wenxin1,Zhuo Zhiqiang1,Liang Xinyu1,Wang Lizhi1,Sun Lili1,Xu Man12,Lin Jinyi1,Huang Wei12ORCID

Affiliation:

1. Key Laboratory of Flexible Electronics (KLoFE) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China

2. State Key Laboratory of Organic Electronics and Information Displays Nanjing University of Posts and Telecommunications Nanjing 210023 China

Abstract

AbstractEmerging 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 cm2, 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 pixels monochromes are fabricated, confirmed the effectiveness of spirofunctionalization in optoelectronics.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

Wiley

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