SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Poster Session I: Plasmonics and nanooptics I
O 11.6: Poster
Montag, 1. März 2021, 10:30–12:30, P
Boosting Light Emission from Single Hydrogen Phthalocyanine Molecules by Charging — •Vibhuti Rai1, Lukas Gerhard1, Qing Sun1, Christof Holzer2, Taavi Repaen3, Marjan Krstic2, Liang Yang3, Martin Wegener3, Carsten Rockstuhl2, and Wulf Wulfhekel1 — 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Germany — 2Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, Germany — 3Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany
The aspect of light emission from single molecules on insulating layers studied by scanning tunneling microscopy induced luminescence (STML) has made considerable progress. Many fundamental aspects of light emission, however, remain unclear for the future prospect of device applications. Here, we used STML to investigate light emission from individual Hydrogen-Phthalocyanine (H2Pc) molecules thermally evaporated onto bi- and trilayers of NaCl on Au(111). Combining STML measurements, full-wave electrodynamics, and quantum chemical calculations, we show that the emitted light from a charged H2Pc couples more efficiently to the far-field than its neutral form [1]. This boost can be explained by the development of a vertical dipole moment normal to the substrate, facilitating out-coupling of the local excitation to the far-field. Since this effect is not related to the specific molecule, it provides a general pathway for enhancing the quantum efficiency of light emission from a molecular junction.
[1] Rai et al. Nano Letters 2020, 20 (10), 7600-7605.