Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Plasmonics and Nanooptics 2
O 61.7: Vortrag
Donnerstag, 8. September 2022, 12:15–12:30, H2
Switching on the electroluminescence of single molecules adsorbed directly on a metal surface — Vibhuti Rai1, •Lukas Gerhard1, Nico Balzer2, Michal Valášek2, Christof Holzer3, Liang Yang2, Martin Wegener2, Carsten Rockstuhl3, 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 — 3Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
Exciting single molecules to emit light into the far-field requires them to be electronically decoupled from the contacting metallic leads. In the scanning tunnelling microscope (STM) geometry, typically this has been achieved by inserting insulating layers between the molecules and the metal substrate [1]. Here, we report our finding that it is possible to activate the electroluminescence (EL) of individual 2,6- core-substituted naphthalene diimide derivatives (Tpd-sNDI), adsorbed directly on a metal surface with the help of the STM tip. We observe that to emit light, both orbitals involved in the optical transition need to be electronically decoupled. The STM measurements were performed with a home-built, low temperature, ultra-high vacuum scanning tunnelling microscope (STM) with optical access [2].
[1] Zhang, Y. et al. Nature 531, 623 (2016).
[2] Edelmann, K. et al. Rev. Sci. Instrum. 89, 123107 (2018).