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Donor-acceptor copolymers with 9-(2-ethylhexyl)carbazole or dibenzothiophene-5,5-dioxide donor units and 5,6-difluorobenzo[c][1,2,5]thiadiazole acceptor units for photonics
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SYSNO ASEP 0578340 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Donor-acceptor copolymers with 9-(2-ethylhexyl)carbazole or dibenzothiophene-5,5-dioxide donor units and 5,6-difluorobenzo[c][1,2,5]thiadiazole acceptor units for photonics Author(s) Cimrová, Věra (UMCH-V) RID, ORCID
Babičová, Petra (UMCH-V) RID
Guesmi, Mariem (UMCH-V) ORCID
Výprachtický, Drahomír (UMCH-V) RID, ORCIDArticle number 2939 Source Title Nanomaterials. - : MDPI
Roč. 13, č. 22 (2023)Number of pages 24 s. Language eng - English Country CH - Switzerland Keywords donor-acceptor copolymers ; 9-(2-ethylhexyl)carbazole ; dibenzothiophene-5,5-dioxide Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GC20-15498J GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 001114985600001 EID SCOPUS 85178342153 DOI 10.3390/nano13222939 Annotation Semiconducting polymers, particularly of the third generation, including donor-acceptor (D-A) copolymers, are extensively studied due to their huge potential for photonic and electronic applications. Here, we report on two new D-A copolymers, CP1 and CP2, composed of different electron-donor (D) units: 9-(2-ethylhexyl)carbazole or dibenzothiophene-5,5-dioxide, respectively, and of 4,7-bis(4′-(2-octyldodecyl)thiophen-2′-yl)-5,6-difluorobenzo[c][1,2,5]thiadiazole building block with central 5,6-difluorobenzo[c][1,2,5]thiadiazole electron-acceptor (A) units, which were synthesized by Suzuki coupling in the high-boiling solvent xylene and characterized. The copolymers exhibited very good thermal and oxidation stability. A copolymer CP1 with different molecular weights was prepared in order to facilitate a comparison of CP1 with CP2 of comparable molecular weight and to reveal the relationship between molecular weight and properties. The photophysical, electrochemical, and electroluminescence properties were examined. Intense red photoluminescence (PL) with higher PL efficiencies for CP1 than for CP2 was observed in both solutions and films. Red shifts in the PL thin film spectra compared with the PL solution spectra indicated aggregate formation in the solid state. X-ray diffraction measurements revealed differences in the arrangement of molecules in thin films depending on the molecular weight of the copolymers. Light-emitting devices with efficient red emission and low onset voltages were prepared and characterized.
Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2024 Electronic address https://www.mdpi.com/2079-4991/13/22/2939
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