Universal 4-qualifiable fluorene-based building blocks for potential optoelectronic applications

• Published in: Chinese chemical letters Vol. 33; no. 12; pp. 5137 - 5141
• Main Authors: An, Xiang, Yang, Jinghao, Xu, Man, Sun, Lili, Bai, Lubing, Wang, Kai, Zhuo, Zhiqiang, Zheng, Yingying, Lin, Jinyi, Ding, Xuehua, Liu, Yuyu, Xie, Linghai, Yin, Chengrong, Huang, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022; State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China; Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China%State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China%Electrical Engineering College,Nanjing Vocational University of Industry Technology,Nanjing 210023,China%Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China; Frontiers Science Center for Flexible Electronics(FSCFE),MIIT Key Laboratory of Flexible Electronics(KLoFE),Northwestern Polytechnical University,Xi'an 710072,China
• Subjects: Deep-blue emission; Morphological stability; Optoelectronic device; Side-chain coupling; Small molecular emitter; Optoelectronic device; Side-chain coupling; Morphological stability; Deep-blue emission; Small molecular emitter
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2022.03.102

In the design of conjugated molecules, modular production enables materials to easily realize structure modification and precisely tune their photoelectrical property. Construction of a novel and universal building block is crucial to design and manufacture high performance and stable conjugated molecules for optoelectronic application. Herein, we originally demonstrated a universal 4-qualifiable fluorene-based building block, which is a fundamental molecular segment to functionalize and obtain novel conjugated materials. Compared to the traditional modification at 9-site, additional 4-position functionalization provided an exciting blueprint to not only tune electronic structure and excited state via p-n molecular design engineering and space charge-transfer strategy, but also allow for optimizing intermolecular arrangement and obtaining solution-processing ability. The introduction of the 4-site substituent in fluorene based semiconductors may endow materials with unique properties. Finally, we successfully prepared two stable deep-blue light-emitting conjugated polymer, PODOPF and PODOF, by utilizing the 4-substituent fluorene based building block. It is believable that the performance, stability and processibility of reported outstanding fluorene-based conjugated molecules can be further optimized based on this universal building block. [Display omitted] The fluorene based building block with 4-site substituent provides an exciting blueprint to not only tune electronic structure and excited state, but also allow for optimizing intermolecular arrangement and obtaining solution-processing ability.