Počet záznamů: 1
Singlet fission in thin films of metallo-supramolecular polymers with ditopic thiophene-bridged terpyridine ligands
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SYSNO ASEP 0477332 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Singlet fission in thin films of metallo-supramolecular polymers with ditopic thiophene-bridged terpyridine ligands Tvůrce(i) 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)Zdroj.dok. Journal of Materials Chemistry C. - : Royal Society of Chemistry - ISSN 2050-7526
Roč. 5, č. 32 (2017), s. 8041-8051Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova triplet exciton ; excimer ; zinc Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GAP108/12/1143 GA ČR - Grantová agentura ČR LD14011 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy LO1507 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000407815800006 EID SCOPUS 85027549097 DOI 10.1039/C7TC00484B Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2018
Počet záznamů: 1