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Accueil > Séminaires > Année 2021 > Séminaire de Fabien Miomandre (7 septembre)

Séminaire de Fabien Miomandre (7 septembre)

ENS Paris-Saclay

par Martrenchard-Barra Séverine - 18 février 2021 (modifié le 30 août 2021)


Le séminaire sera accessible dans l’amphi et également diffusé en visioconférence. Les personnes extérieures au laboratoire qui souhaitent disposer du lien sont invitées à envoyer un mail à l’adresse

seminaires.ismo@universite-paris-saclay.fr

Elles recevront le lien pour se connecter en retour.

Electrochemical control of fluorescence : from molecules to mechanistic studies at the microscopical level

Chemicals exhibiting a reversible modulation of their emission properties according to their redox state have been the subject of a recent growing interest due to possible applications in displays, sensors or biomedical imaging1. We will briefly browse the working principle, requirements and the main families of compounds used for that purpose2.
To investigate how these photoluminescence properties can be tuned using an electrochemical signal as a switch of the redox state, we designed a dedicated set-up combining fluorescence and electrochemical microscopies. The aim is to determine the photophysical features in operando and at the microscopic level. We recently demonstrated that these combined microscopies can be actually used with a single unit playing the role of both the fluorophore and redox mediator3, either in organic or aqueous medium4. Moreover, using a pulsed laser source enables to follow the variation of the excited state lifetime, bringing important information to decipher the mechanism involved and in particular highlight the role of a photoinduced electron transfer in the variation of fluorescence intensity with the electrode potential.

1. P. Audebert, F. Miomandre, Chemical Science 2013, 4 575.
2. F. Miomandre, Current Opinion in Electrochemistry, 2020, 24, 56.
3. Legras, L. ; Audibert, J. F. ; Dubacheva, G. V. ; Miomandre, F., Chemical Science 2018, 9 5897.
4. Guerret-Legras, L. ; Audibert, J. F. ; Ojeda, I. M. G. ; Dubacheva, G. V. ; Miomandre, F., Electrochimica Acta 2019, 305, 370-377.