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Singlet fission in thin films of metallo-supramolecular polymers with ditopic thiophene-bridged terpyridine ligands
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SYSNO ASEP 0477332 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Singlet fission in thin films of metallo-supramolecular polymers with ditopic thiophene-bridged terpyridine ligands Author(s) Rais, David (UMCH-V) RID
Pfleger, Jiří (UMCH-V) RID
Menšík, Miroslav (UMCH-V) RID
Zhigunov, Alexander (UMCH-V) RID, ORCID
Štenclová, P. (CZ)
Svoboda, Jan (UMCH-V) ORCID, RID
Vohlídal, J. (CZ)Source Title Journal of Materials Chemistry C. - : Royal Society of Chemistry - ISSN 2050-7526
Roč. 5, č. 32 (2017), s. 8041-8051Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords triplet exciton ; excimer ; zinc Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GAP108/12/1143 GA ČR - Czech Science Foundation (CSF) LD14011 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UMCH-V - RVO:61389013 UT WOS 000407815800006 EID SCOPUS 85027549097 DOI 10.1039/C7TC00484B Annotation The singlet fission (SF) phenomenon is currently investigated for its potential to overcome the Shockley–Queisser energy conversion efficiency limit of single-junction photovoltaic (PV) cells. One of the hurdles of using SF for PV cells is the limited choice among the presently available SF materials. We compare the photophysical behavior of thin solid films of two novel compounds: a ditopic ligand bis(terpyridine-4´-yl)terthiophene (T) and a metallo-supramolecular polymer (MSP), prepared by the coordination of T to Zn2+ ions (PT). The transient absorption kinetics in PT after photoexcitation into its second electronic excited state was consistent with an ultrafast (SF) process with a time constant of 160 fs. The lifetime of such a formed triplet state reached only 1 ns, due to mutual bimolecular annihilation, which also hindered the determination of the yield of the triplet state formation. In contrast, the metal-free thin films of T showed no signs of SF, but rather profound exciton relaxation through an excimer formation. Powder WAXS diffractograms pointed out a lower degree of structural order in the PT than that in the T – which may be the probable reason for differences in energy relaxation pathways of these two materials. To the best of our knowledge, singlet fission has not yet been reported in the MSP class of materials. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2018
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