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  1. Artikel ; Online: Spectral Dependence of the Energy Transfer from Photosynthetic Complexes to Monolayer Graphene

    Marcin Szalkowski / Alessandro Surrente / Kamil Wiwatowski / Zhuo Yang / Nan Zhang / Julian D. Janna Olmos / Joanna Kargul / Paulina Plochocka / Sebastian Maćkowski

    International Journal of Molecular Sciences, Vol 23, Iss 3493, p

    2022  Band 3493

    Abstract: Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the ... ...

    Abstract Fluorescence excitation spectroscopy at cryogenic temperatures carried out on hybrid assemblies composed of photosynthetic complexes deposited on a monolayer graphene revealed that the efficiency of energy transfer to graphene strongly depended on the excitation wavelength. The efficiency of this energy transfer was greatly enhanced in the blue-green spectral region. We observed clear resonance-like behavior for both a simple light-harvesting antenna containing only two chlorophyll molecules (PCP) and a large photochemically active reaction center associated with the light-harvesting antenna (PSI–LHCI), which pointed towards the general character of this effect.
    Schlagwörter graphene ; energy transfer ; fluorescence ; photosynthetic complexes ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Sprache Englisch
    Erscheinungsdatum 2022-03-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Fine Structure Splitting of Phonon-Assisted Excitonic Transition in (PEA) 2 PbI 4 Two-Dimensional Perovskites

    Katarzyna Posmyk / Mateusz Dyksik / Alessandro Surrente / Katarzyna Zalewska / Maciej Śmiertka / Ewelina Cybula / Watcharaphol Paritmongkol / William A. Tisdale / Paulina Plochocka / Michał Baranowski

    Nanomaterials, Vol 13, Iss 1119, p

    2023  Band 1119

    Abstract: Two-dimensional van der Waals materials exhibit particularly strong excitonic effects, which causes them to be an exceptionally interesting platform for the investigation of exciton physics. A notable example is the two-dimensional Ruddlesden–Popper ... ...

    Abstract Two-dimensional van der Waals materials exhibit particularly strong excitonic effects, which causes them to be an exceptionally interesting platform for the investigation of exciton physics. A notable example is the two-dimensional Ruddlesden–Popper perovskites, where quantum and dielectric confinement together with soft, polar, and low symmetry lattice create a unique background for electron and hole interaction. Here, with the use of polarization-resolved optical spectroscopy, we have demonstrated that the simultaneous presence of tightly bound excitons, together with strong exciton–phonon coupling, allows for observing the exciton fine structure splitting of the phonon-assisted transitions of two-dimensional perovskite (PEA) <semantics> 2 </semantics> PbI <semantics> 4 </semantics> , where PEA stands for phenylethylammonium. We demonstrate that the phonon-assisted sidebands characteristic for (PEA) <semantics> 2 </semantics> PbI <semantics> 4 </semantics> are split and linearly polarized, mimicking the characteristics of the corresponding zero-phonon lines. Interestingly, the splitting of differently polarized phonon-assisted transitions can be different from that of the zero-phonon lines. We attribute this effect to the selective coupling of linearly polarized exciton states to non-degenerate phonon modes of different symmetries resulting from the low symmetry of (PEA) <semantics> 2 </semantics> PbI <semantics> 4 </semantics> lattice.
    Schlagwörter 2D perovskites ; exciton ; phonon ; optical spectroscopy ; fine structure splitting ; (PEA)2PbI4 ; Chemistry ; QD1-999
    Thema/Rubrik (Code) 511
    Sprache Englisch
    Erscheinungsdatum 2023-03-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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