Single-molecule phosphorescence and intersystem crossing in a coupled exciton-plasmon system
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912470505881600 |
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| author | Grewal, Abhishek Imada, Hiroshi Miwa, Kuniyuki Imai-Imada, Miyabi Kimura, Kensuke Jaculbia, Rafael Kuhnke, Klaus Kern, Klaus Kim, Yousoo |
| author_facet | Grewal, Abhishek Imada, Hiroshi Miwa, Kuniyuki Imai-Imada, Miyabi Kimura, Kensuke Jaculbia, Rafael Kuhnke, Klaus Kern, Klaus Kim, Yousoo |
| contents | Scanning the sharp metal tip of a scanning tunneling microscope (STM) over a molecule allows tuning the coupling between the tip plasmon and a molecular fluorescence emitter. This allows access to local variations of fluorescence field enhancement and wavelength shifts, which are central parameters for characterizing the plasmon-exciton coupling. Performing the same for phosphorescence with molecular scale resolution remains a significant challenge. In this study, we present the investigation of phosphorescence from isolated Pt-Phthalocyanine molecules by analyzing tip-enhanced emission spectra in both current-induced and laser-induced phosphorescence. The latter directly monitors singlet-to-triplet state intersystem crossing of a molecule below the tip. The study contributes to a detailed understanding of triplet excitation pathways and their potential control at sub-molecular length scales. Additionally, the coupling of organic phosphors to plasmonic structures is a promising route for improving light-emitting diodes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_10150 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single-molecule phosphorescence and intersystem crossing in a coupled exciton-plasmon system Grewal, Abhishek Imada, Hiroshi Miwa, Kuniyuki Imai-Imada, Miyabi Kimura, Kensuke Jaculbia, Rafael Kuhnke, Klaus Kern, Klaus Kim, Yousoo Mesoscale and Nanoscale Physics Scanning the sharp metal tip of a scanning tunneling microscope (STM) over a molecule allows tuning the coupling between the tip plasmon and a molecular fluorescence emitter. This allows access to local variations of fluorescence field enhancement and wavelength shifts, which are central parameters for characterizing the plasmon-exciton coupling. Performing the same for phosphorescence with molecular scale resolution remains a significant challenge. In this study, we present the investigation of phosphorescence from isolated Pt-Phthalocyanine molecules by analyzing tip-enhanced emission spectra in both current-induced and laser-induced phosphorescence. The latter directly monitors singlet-to-triplet state intersystem crossing of a molecule below the tip. The study contributes to a detailed understanding of triplet excitation pathways and their potential control at sub-molecular length scales. Additionally, the coupling of organic phosphors to plasmonic structures is a promising route for improving light-emitting diodes. |
| title | Single-molecule phosphorescence and intersystem crossing in a coupled exciton-plasmon system |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2502.10150 |