Effects of Replacement on the Optical Properties of Narrow Bandgap Polymers: Comparing the Difference Between Thieno[3,2-b]thiophene Units and Thiophene Units

doi:10.1007/s40242-019-8212-8

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (1): 146-149.doi: 10.1007/s40242-019-8212-8

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Effects of Replacement on the Optical Properties of Narrow Bandgap Polymers: Comparing the Difference Between Thieno[3,2-b]thiophene Units and Thiophene Units

CHEN Ying, WANG Wenyan, SUI Ning, WANG Yinghui, CHI Xiaochun, KANG Zhihui, ZHANG Hanzhuang, NI Moucui

Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China

Received:2018-06-26 Revised:2018-11-09 Online:2019-02-01 Published:2018-12-05
Contact: SUI Ning, NI Moucui E-mail:sui@jlu.edu.cn;nimc@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21573094, 51502109, 11774122, 11574112, 11474131), the National Found for Fostering Talents of Basic Science of China(No.J1103202) and the Science and Technology Projects in the 13th Five-year Plan of the Education Department of Jilin Province, China(No.2016-402).

Abstract

Abstract: The effects of replacement on the optical properties of diketopyrrolopyrrole (DPP)-based polymers were discussed through replacing the thieno [3, 2-b]thiophene units by thiophene units. It is easy to see that the role of replacement would lead to blue shift of steady-state absorption spectrum when thieno [3, 2-b]thiophene units is replaced by thiophene units. Meanwhile, the transient absorption data indicate that the role of replacement would not change the relaxation mechanism of polymer, but is able to adjust the photo-excitation relaxation rate of polymer. Their intensity-dependent dynamic curves show that the exciton-exciton annihilation (EEA) would participate in the relaxation process when the polymer is in the aggregation. Through comparing the EEA data between the polymers, it is found that the role of replacement would change the spatial distribution of exciton.

Key words: Transient absorption spectroscopy, Dynamics, Thieno[3,2-b]thiophene, Replacement

CHEN Ying, WANG Wenyan, SUI Ning, WANG Yinghui, CHI Xiaochun, KANG Zhihui, ZHANG Hanzhuang, NI Moucui. Effects of Replacement on the Optical Properties of Narrow Bandgap Polymers: Comparing the Difference Between Thieno[3,2-b]thiophene Units and Thiophene Units[J]. Chemical Research in Chinese Universities, 2019, 35(1): 146-149.

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Effects of Replacement on the Optical Properties of Narrow Bandgap Polymers: Comparing the Difference Between Thieno[3,2-b]thiophene Units and Thiophene Units

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