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KRATOCHVÍL, M. THOTTAPPALI, M. A. LUŇÁK, S. PAUK, K. RAIS, D. MARKOVÁ, A. PFLEGER, J. IMRAMOVSKÝ, A. VALA, M.
Original Title
Solid-State Absorption, Luminescence, and Singlet Fission of Furanyl-Substituted Diketopyrrolopyrroles with Different π-Stacking Arrangements
Type
journal article in Web of Science
Language
English
Original Abstract
Small modifications of the diketopyrrolopyrrole (DPP) molecular structure induced remarkable changes in its spectral and photophysical behavior. Using furan (F) heterosubstitution instead of thiophene (T) substituent resulted in a small blue shift and decreased Huang-Rhys factor of the absorption spectra in solution, irrespectively to N,N'-alkyls. Branching of alkyl side chains by formal 2-ethylation of n-hexyl substituent (C6 to EH) switched the slipped-stack arrangement, irrespectively on the heteroatoms. Consequent changes in steady-state absorption spectra of thin films were interpreted using time dependent density functional theory calculations, carried out on model dimers. Solid-state luminescence is weak and partially dependent on an excitation wavelength. Singlet fission was observed by femtosecond transient absorption spectroscopy, with considerably different yields for variously pi-stacked FDPP-EH (30 %) and FDPP-C6 (160 %). The shape of triplet-triplet absorption spectra was also influenced by various pi-stacking. The results are discussed in terms of different mixing of both Frenkel and charge transfer states in model dimers and different excitonic and electronic coupling in both types of pi-stacks, visualized by natural transition orbitals. Furanyl-substituted diketopyrrolopyrroles (DPP) with different branching of the alkyl side chains were studied. Both formed two distinct types of pi-stacking leading to H-aggregates with considerably different energetics in terms of mixed lowest Frenkel and charge transfer (CT) states. The combined effect of the molecular structure and solid-state arrangement lead to fast and efficient CT mediated singlet fission, with one of the highest efficiencies (160 %) ever reported within the DPP family.image
Keywords
singlet fission; diketopyrrolopyrrole; solid state photophysics; triplet excitons; aggregates
Authors
KRATOCHVÍL, M.; THOTTAPPALI, M. A.; LUŇÁK, S.; PAUK, K.; RAIS, D.; MARKOVÁ, A.; PFLEGER, J.; IMRAMOVSKÝ, A.; VALA, M.
Released
12. 10. 2023
Publisher
WILEY-V C H VERLAG GMBH
Location
WEINHEIM
ISBN
2367-0932
Periodical
ChemPhotoChem
Year of study
e202300201
Number
October
State
Federal Republic of Germany
Pages count
10
URL
https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cptc.202300201
BibTex
@article{BUT185071, author="KRATOCHVÍL, M. and THOTTAPPALI, M. A. and LUŇÁK, S. and PAUK, K. and RAIS, D. and MARKOVÁ, A. and PFLEGER, J. and IMRAMOVSKÝ, A. and VALA, M.", title="Solid-State Absorption, Luminescence, and Singlet Fission of Furanyl-Substituted Diketopyrrolopyrroles with Different π-Stacking Arrangements", journal="ChemPhotoChem", year="2023", volume="e202300201", number="October", pages="10", doi="10.1002/cptc.202300201", issn="2367-0932", url="https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cptc.202300201" }