Fluorescence of CoTPP Mediated by the Plasmon–Exciton Coupling Effect in the Tunneling Junction

CoTPP, as a common hypsoporphyrin, is usually not a luminescent molecule because of the open-shell Co ion. In this paper, well-defined multilayer CoTPP molecules self-assembled on Au(111) surface are characterized layer by layer with scanning tunneling microscope (STM) induced luminescence. By using...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2021-06, Vol.12 (22), p.5349-5356
Main Authors: Liu, Yiting, Bian, Yajie, Zhang, Yuyi, Hang, Chao, Zhang, Xiaolei, Lou, Shitao, Jin, Qingyuan
Format: Article
Language:English
Subjects:
Physical Insights into Materials and Molecular Properties
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Summary:CoTPP, as a common hypsoporphyrin, is usually not a luminescent molecule because of the open-shell Co ion. In this paper, well-defined multilayer CoTPP molecules self-assembled on Au(111) surface are characterized layer by layer with scanning tunneling microscope (STM) induced luminescence. By using the highly localized STM tunneling current, we not only investigate the influence of bias polarity on the amplitude of distinct plasmonic emission resulted from the interaction between the metal substrate and the metal ions but also first obtain the light emission from the hypsoporphyrins in the tunneling junction. The density-matrix method and the combined approach of classical electrodynamics and first-principles calculation are used to explain the mechanism of the light emission. These findings may expand the underlying physics of plasmon–exciton coupling in STM nanocavity and reveal a new possible path to overcome the fluorescent potential of hypsoporphyrins by the intense localized electric fields.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.1c01123