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Carbazole-fluorene copolymers with various substituents at the carbazole nitrogen: structure-properties relationship
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SYSNO ASEP 0573524 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Carbazole-fluorene copolymers with various substituents at the carbazole nitrogen: structure-properties relationship Author(s) Cimrová, Věra (UMCH-V) RID, ORCID
Výprachtický, Drahomír (UMCH-V) RID, ORCID
Růžička, Aleš (UMCH-V) RID
Pokorná, Veronika (UMCH-V) RIDArticle number 2932 Source Title Polymers. - : MDPI
Roč. 15, č. 13 (2023)Number of pages 21 s. Language eng - English Country CH - Switzerland Keywords carbazole-fluorene copolymers ; iridium complex ; synthesis 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 001028291600001 EID SCOPUS 85164735888 DOI 10.3390/polym15132932 Annotation Carbazole derivatives, carbazole-containing polymers and iridium complexes are of interest due to many possible applications in photonics, electronics and biology, particularly as active or hole-transporting layers in organic as well as perovskite devices due to their interesting properties. Here, a series of carbazole-fluorene conjugated copolymers with various substituents at the N-carbazole position (2-methoxycarbonylethyl, 2-carboxyethyl, 2-ethylhexyl, and nonan-2,4-dionatoiridium(III)bis(2-phenylpyridine-N,C2′)-9-yl) was prepared by Suzuki coupling. Their photophysical, electrochemical and electroluminescence (EL) properties were studied. Effects of molecular weight and substituents attached to carbazole unit on their properties are reported. The carbazole-fluorene copolymers in dilute solutions exhibited intense photoluminescence (PL) emission in the blue spectral region with high PL quantum yields (78–87%) except for the copolymer with the iridium complex (23%). Similar PL spectra were observed in dilute solutions. More pronounced differences were found in thin film PL and EL properties due to excimer/aggregate formation. Light-emitting devices (LEDs) made of copolymers with 2-ethylhexyl as N-carbazole substituent exhibited efficient EL emission with the best performance and the lowest EL onset voltages (3–4 V), while the LEDs made of copolymers with other substituents were not as efficient, but showed anomalous behavior and memory effects in current-voltage characteristics promising also for bio-inspired electronics.
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/2073-4360/15/13/2932
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