TCNQ-based organic cocrystal integrated red emission and n-type charge transport

Mengjia Jiang; Shuyu Li; Chun Zhen; Lingsong Wang; Fei Li; Yihan Zhang; Weibing Dong; Xiaotao Zhang; Wenping Hu

doi:10.1007/s12200-022-00022-7

TCNQ-based organic cocrystal integrated red emission and n-type charge transport

Front Optoelectron. 2022 May 9;15(1):21. doi: 10.1007/s12200-022-00022-7.

Authors

Mengjia Jiang¹, Shuyu Li², Chun Zhen¹, Lingsong Wang¹, Fei Li¹, Yihan Zhang¹, Weibing Dong³, Xiaotao Zhang^{4

5}, Wenping Hu^{6

7}

Affiliations

¹ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China.
² Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.
³ Key Laboratory of Resource Chemistry and Eco-Environmental Protection in Qinghai-Tibet Plateau, School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining, 810007, China.
⁴ Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China. zhangxt@tju.edu.cn.
⁵ Key Laboratory of Resource Chemistry and Eco-Environmental Protection in Qinghai-Tibet Plateau, School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining, 810007, China. zhangxt@tju.edu.cn.
⁶ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China. huwp@tju.edu.cn.
⁷ Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou, 350207, China. huwp@tju.edu.cn.

Abstract

Simultaneously realizing the optical and electrical properties of organic materials is always challenging. Herein, a convenient and promising strategy for designing organic materials with integrated optoelectronic properties based on cocrystal engineering has been put forward. By selecting the fluorene (Flu) and the 7,7',8,8'-tetracyanoquinodimethane (TCNQ) as functional constituents, the Flu-TCNQ cocrystal prepared shows deep red emission at 702 nm, which is comparable to the commercialized red quantum dot. The highest electron mobility of organic field-effect transistor (OFET) based on Flu-TCNQ is 0.32 cm² V^-1 s^-1. Spectroscopic analysis indicates that the intermolecular driving force contributing to the co-assembly of Flu-TCNQ is mainly charge transfer (CT) interaction, which leads to its different optoelectronic properties from constituents.

Keywords: Charge transfer (CT); Integrated optoelectronic properties; Organic cocrystal; Red emission; n-type charge transport.