Effective π-electron number and symmetry perturbation effect on the two-photon absorption of oligofluorenes

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dc.creatorAbegão, Luis Miguel Gomes
dc.creatorCocca, Leandro Henrique Zucolotto
dc.creatorMulatier, Jean-Christophe
dc.creatorPitrat, Delphine
dc.creatorAndraud, Chantal
dc.creatorMisoguti, Lino
dc.creatorMendonça, Cleber Renato
dc.creatorVivas, Marcelo Gonçalves
dc.creatorDe Boni, Leonardo
dc.date.accessioned2024-03-04T14:31:27Z
dc.date.available2024-03-04T14:31:27Z
dc.date.issued2021
dc.description.abstractFluorene-based molecules exhibit significant nonlinear optical responses and multiphoton absorption in the visible region, which, combined with the high fluorescence quantum yield in organic solvents, could make this class of materials potentially engaging in diverse photonics applications. Thus, herein, we have determined the two-photon absorption (2PA) of oligofluorenes containing three, five, and seven repetitive units by employing the wavelength-tunable femtosecond Z-scan technique. Our outcomes have shown that the 2PA cross-section in oligofluorenes presents an enhanced value of around 18 GM per Neff, in which Neff is the effective number of π-electrons, for the pure 2PA allowed transition (11Ag-like → 21Ag-like). Furthermore, a weak 2PA transition was observed in the same spectral region strongly allowed by one-photon absorption (11Ag-like → 11Bu-like). This last result suggests a molecular symmetry perturbation, probably induced by the molecular disorder triggered by the increase of moieties in the oligofluorene structure. We have calculated the permanent dipole moment difference related to the lowest-energy transition using the Lippert-Matagaformalism and the 2PA sum-over-states approach to confirm this assumption. Moreover, we have estimated the fundamental limits for the 2PA cross-section in oligofluorenes.
dc.identifier.citationABEGÃO, Luis M. G. et al. Effective π-electron number and symmetry perturbation effect on the two-photon absorption of oligofluorenes. Physical Chemistry Chemical Physics, Londres, n. 34, e106423, 2021. DOI: 10.1039/D1CP02553H. Disponível em: https://pubs.rsc.org/en/content/articlelanding/2021/cp/d1cp02553h. Acesso em: 28 fev. 2024.
dc.identifier.doi10.1039/D1CP02553H
dc.identifier.issne- 1463-9084
dc.identifier.issn1463-9076
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2021/cp/d1cp02553h
dc.language.isoeng
dc.publisher.countryGra-bretanha
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.titleEffective π-electron number and symmetry perturbation effect on the two-photon absorption of oligofluorenes
dc.typeArtigo

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