Internal Stark effect of single-molecule fluorescence

Kirill Vasilev, Benjamin Doppagne, Tomáš Neuman, Anna Rosławska, Hervé Bulou, Alex Boeglin, Fabrice Scheurer and Guillaume Schull ()
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Kirill Vasilev: CNRS, IPCMS
Benjamin Doppagne: CNRS, IPCMS
Tomáš Neuman: CNRS, IPCMS
Anna Rosławska: CNRS, IPCMS
Hervé Bulou: CNRS, IPCMS
Alex Boeglin: CNRS, IPCMS
Fabrice Scheurer: CNRS, IPCMS
Guillaume Schull: CNRS, IPCMS

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The optical properties of chromophores can be efficiently tuned by electrostatic fields generated in their close environment, a phenomenon that plays a central role for the optimization of complex functions within living organisms where it is known as internal Stark effect (ISE). Here, we realised an ISE experiment at the lowest possible scale, by monitoring the Stark shift generated by charges confined within a single chromophore on its emission energy. To this end, a scanning tunneling microscope (STM) functioning at cryogenic temperatures is used to sequentially remove the two central protons of a free-base phthalocyanine chromophore deposited on a NaCl-covered Ag(111) surface. STM-induced fluorescence measurements reveal spectral shifts that are associated to the electrostatic field generated by the internal charges remaining in the chromophores upon deprotonation.

Date: 2022
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DOI: 10.1038/s41467-022-28241-8

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