Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Plasmonics and Nanooptics 2
O 61.5: Vortrag
Donnerstag, 8. September 2022, 11:45–12:00, H2
Light emission from single self-decoupled molecules — •Vibhuti Rai1, Lukas Gerhard1, Gabriel Derenbach1, Nico Balzer2, Michal Valášek2, Marcel Mayor2, and Wulf Wulfhekel1 — 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein-Leopoldshafen, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein-Leopoldshafen, Germany
Realization of single molecules as electric light sources faces a dilemma: In order to emit light, they need to be decoupled from the metallic electrodes to prevent fluorescence quenching. To conduct, however, the molecular orbitals need to hybridize with the electrodes. This can be achieved by decoupling the molecular chromophore to a certain extent from the electrode via anchoring groups. In the past, such self-decoupled molecules often lacked reproducibility of the decoupling and energy of the emitted light. Here, we show reproducible and well defined electroluminescence of two different NDI chromophores linked to a gold substrate via a molecular tripod and via a vacuum barrier to the tip of a scanning tunnelling microscope [1]. The stability of the system allows to perform systematic experiments so far only possible for molecules decoupled via insulating layers.
[1] Edelmann, K. et al. Rev. Sci. Instrum. 89, 123107 (2018).