Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 15: Organic Molecules on Inorganic Substrates II: Mainly Porphyrins
O 15.5: Talk
Monday, March 16, 2020, 16:15–16:30, REC C 213
Exciton control in single-molecule fluorochromes — •Jiří Doležal1,2, Pablo Merino3,4, Pingo Mutombo1, Pavel Jelínek1 und Martin Švec1 — 1Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 2Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 3Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz 3, E28049, Madrid, Spain — 4Instituto de Física Fundamental, CSIC, Serrano 121, E28006, Madrid, Spain
Plasmonic picocavities in highly defined environment of ultrahigh vacuum and cryogenic temperatures represent ideal testbeds for investigation of the photophysical properties of single-molecule photon emitters and to explore fundamental aspects of their luminescence. In this work, we studied two structural analogs with distinct electronic properties using a photon-scanning probe microscope: CuPc and ZnPc molecules adsorbed on NaCl / Ag(111) substrates. For the CuPc, we determine how its exact adsorption configuration and coupling to the substrate affect the S1 exciton energy and lifetime. For the ZnPc molecule, two competing excitons [1] are mapped in the real-space with submolecular resolution. Both phenomena are discussed in a broader context of ab-initio simulations and additional experimental evidence available from the atomic force and electron tunneling channels of the microscope.
[1] Doppagne B, Chong MC, Bulou H, Boeglin A, Scheurer F, Schull G. Electrofluorochromism at the single-molecule level. Science 2018;361:251-5.