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O: Fachverband Oberflächenphysik

O 2: Organic Molecules on Inorganic Substrates I: Electronic, Optical and Other Properties I

O 2.5: Vortrag

Montag, 27. März 2023, 11:30–11:45, CHE 89

Illuminating an individual non-fluorescent molecule — •Tzu-Chao Hung^1,2, Yokari Godinez Loyola³, Manuel Steinbrecher¹, Brian Kiraly¹, Alexander A. Khajetoorians¹, Nikos L. Doltsinis³, Cristian A. Strassert³, and Daniel Wegner¹ — ¹Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands — ²Department of Physics, University of Regensburg, Regensburg, 93040, Germany — ³Physikalisches Institut and Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Combining scanning tunneling microscopy, spectroscopy and STM-induced luminescence (STML) allows us to study the optoelectronic properties down to the atomic scale. Generalizing the atomic control and imaging capabilities of STML to phosphorescent or even non-fluorescent molecules can provide a new route to fundamentally understand the photophysical properties of an individual molecule. Nickel phthalocyanine (NiPc) is a non-fluorescent molecule. Light emission from the ligand-centered excited state known as Q-band is quenched due to fast relaxation into the nonradiative metal-centered excited state. Hence, the transition energy of the Q-band can only be determined by absorption spectroscopy. Here, we propose an alternative approach to activate radiative decay of the Q-band of NiPc by utilizing STML in combination with control of the local environment and discuss the involved excitation and relaxation pathways. We compare our results with optical spectroscopy and ab initio calculations and discuss the involved excitation and relaxation pathways.