article published yes Angela L. Paoletta author Norah M. Hoffmann author Daniel W. Cheng author Emma York author Ding Xu author Boyuan Zhang author Milan Delor author Timothy C. Berkelbach author Latha Venkataraman author 9ebb78a5-cc0d-11ee-8322-fae086a32caf0000-0002-6957-6089 Single molecules bridging two metallic electrodes can emit light through electroluminescence when subjected to a bias voltage. Typically, light emission in such devices results from transitions between molecular states, although in the presence of light-matter coupling, the emission can result from a transition between hybrid light-matter states. Here, we create single metal-molecule-metal junctions and simultaneously collect conductance and electroluminescence data using a scanning tunneling microscope (STM) equipped with a custom spectrometer. Through experimental analysis and electronic structure calculations, we provide evidence for a molecule-electrode interfacial exciton coupled to a junction cavity plasmon. Importantly, we find that close to resonant transport conditions, the molecular junction functions as a single emitter that is strongly coupled to the junction cavity mode, leading to characteristic Rabi splitting of the emission spectrum and providing the first example of an electroluminescence-driven single-molecule system in the regime of strong light-matter coupling. American Chemical Society2024 eng 0002-7863 1520-5126 3963097910.1021/jacs.4c09782 1465034394-34400 yes Paoletta AL, Hoffmann NM, Cheng DW, et al. Plasmon-exciton strong coupling in single-molecule junction electroluminescence. <i>Journal of the American Chemical Society</i>. 2024;146(50):34394-34400. doi:<a href="https://doi.org/10.1021/jacs.4c09782">10.1021/jacs.4c09782</a> Paoletta, Angela L., et al. “Plasmon-Exciton Strong Coupling in Single-Molecule Junction Electroluminescence.” <i>Journal of the American Chemical Society</i>, vol. 146, no. 50, American Chemical Society, 2024, pp. 34394–400, doi:<a href="https://doi.org/10.1021/jacs.4c09782">10.1021/jacs.4c09782</a>. Paoletta AL, Hoffmann NM, Cheng DW, York E, Xu D, Zhang B, Delor M, Berkelbach TC, Venkataraman L. 2024. Plasmon-exciton strong coupling in single-molecule junction electroluminescence. Journal of the American Chemical Society. 146(50), 34394–34400. A.L. Paoletta, N.M. Hoffmann, D.W. Cheng, E. York, D. Xu, B. Zhang, M. Delor, T.C. Berkelbach, L. Venkataraman, Journal of the American Chemical Society 146 (2024) 34394–34400. Paoletta, Angela L., Norah M. Hoffmann, Daniel W. Cheng, Emma York, Ding Xu, Boyuan Zhang, Milan Delor, Timothy C. Berkelbach, and Latha Venkataraman. “Plasmon-Exciton Strong Coupling in Single-Molecule Junction Electroluminescence.” <i>Journal of the American Chemical Society</i>. American Chemical Society, 2024. <a href="https://doi.org/10.1021/jacs.4c09782">https://doi.org/10.1021/jacs.4c09782</a>. Paoletta, A. L., Hoffmann, N. M., Cheng, D. W., York, E., Xu, D., Zhang, B., … Venkataraman, L. (2024). Plasmon-exciton strong coupling in single-molecule junction electroluminescence. <i>Journal of the American Chemical Society</i>. American Chemical Society. <a href="https://doi.org/10.1021/jacs.4c09782">https://doi.org/10.1021/jacs.4c09782</a> A. L. Paoletta <i>et al.</i>, “Plasmon-exciton strong coupling in single-molecule junction electroluminescence,” <i>Journal of the American Chemical Society</i>, vol. 146, no. 50. American Chemical Society, pp. 34394–34400, 2024. 205292025-10-23T12:20:19Z2025-10-23T13:03:41Z