Control of the radiative properties of functional molecules near metals is a key issue in nano-optics, and is particularly important in the fields of energy transfer and light manipulation at the nanoscale1,2 and the development of plasmonic devices3,4,5. Despite the various vibronic transitions (S1(v′) → S0(v)) available for frequency tuning of fluorescence, the molecular emissions near metals reported to date have been subject to Kasha's rule, with radiative decay from the lowest excited state (S1(0)) (refs 6–10). Here, we show resonant hot electroluminescence arising directly from higher vibronic levels of the singlet excited state (S1(v′ > 0)) for porphyrin molecules confined inside a nanocavity in a scanning tunnelling microscope, by spectrally tuning the frequency of plasmons. We also demonstrate the generation of unexpected upconversion electroluminescence. These observations suggest that the local nanocavity plasmons behave like a strong coherent optical source with tunable energy, and can be used to actively control the radiative channels of molecular emitters by means of intense resonance enhancement of both excitation and emission.
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Chance, R. R., Prock, A. & Silbey, R. Molecular fluorescence and energy transfer near interfaces. Adv. Chem. Phys. 37, 1–65 (1978).
Greffet, J.-J. Nanoantennas for light emission. Science 308, 1561–1563 (2005).
Michaelis, J., Hettich, C., Mlynek, J. & Sandoghdar, V. Optical microscopy using a single-molecule light source. Nature 405, 325–328 (2000).
Barnes, W. L., Dereux, A. & Ebbesen, T. W. Surface plasmon subwavelength optics. Nature 424, 824–830 (2003).
Chang, D. E., Sørensen, A. S., Hemmer, P. R. & Lukin, M. D. Quantum optics with surface plasmons. Phys. Rev. Lett. 97, 053002 (2006).
Kühn, S., Håkanson, U. H., Rogobete, L. & Sandoghdar, V. Enhancement of single-molecule fluorescence using a gold nanoparticle as an optical nanoantenna. Phys. Rev. Lett. 97, 017402 (2006).
Anger, P., Bharadwaj, P. & Novotny, L. Enhancement and quenching of single-molecule fluorescence. Phys. Rev. Lett. 96, 113002 (2006).
Wrigge, G., Gerhardt, I., Hwang, J., Zumofen, G. & Sandoghdar, V. Efficient coupling of photons to a single molecule and the observation of its resonance fluorescence. Nature Phys. 4, 60–66 (2008).
Ringler, M. et al. Shaping emission spectra of fluorescent molecules with single plasmonic nanoresonators. Phys. Rev. Lett. 100, 203002 (2008).
Tam, F., Goodrich, G. P., Johnson, B. R. & Halas, N. J. Plasmonic enhancement of molecular fluorescence. Nano Lett. 7, 496–501 (2007).
Rebane, K. & Saari, P. Hot luminescence and relaxation processes in resonant secondary emission of solid matter. J. Lumin. 16, 223–243 (1978).
Ritchie, G. & Burstein, E. Luminescence of dye molecules adsorbed at a Ag surface. Phys. Rev. B 24, 4843–4846 (1981).
Le Ru, E. C. et al. Mechanisms of spectral profile modification in surface-enhanced fluorescence. J. Phys. Chem. C 111, 16076–16079 (2007).
Aizpurua, J., Hoffmann, G., Apell, S. P. & Berndt, R. Electromagnetic coupling on an atomic scale. Phys. Rev. Lett. 89, 156803 (2002).
Johansson, P. Light emission from a scanning tunneling microscope: fully retarded calculation. Phys. Rev. B 58, 10823–10834 (1998).
Qiu, X. H., Nazin, G. V. & Ho, W. Vibrationally resolved fluorescence excited with submolecular precision. Science 299, 542–546 (2003).
Dong, Z. C. et al. Vibrationally resolved fluorescence from organic molecules near metal surfaces in a scanning tunneling microscope. Phys. Rev. Lett. 92, 086801 (2004).
Ćavar, E. et al. Fluorescence and phosphorescence from individual C60 molecules excited by local electron tunneling. Phys. Rev. Lett. 95, 196102 (2005).
Berndt, R. et al. Photon emission at molecular resolution induced by a scanning tunneling microscope. Science 262, 1425–1427 (1993).
Gouterman, M. Optical Spectra and Electronic Structure of Porphyrins and Related Rings in The Porphyrins (ed. Dolphin, D.) Vol. 3, Ch. 1, 1–165 (Academic Press, 1978).
Schull, G., Neel, N., Johansson, P. & Berndt, R. Electron–plasmon and electron–electron interactions at a single atom contact. Phys. Rev. Lett. 102, 057401 (2009).
Aizpurua, J., Apell, S. P. & Berndt, R. Role of tip shape in light emission from the scanning tunneling microscope. Phys. Rev. B 62, 2065–2073 (2000).
Zhao, J. et al. Interaction of plasmon and molecular resonances for rhodamine 6G adsorbed on silver nanoparticles. J. Am. Chem. Soc. 129, 7647–7656 (2007).
Lombardi, J. R., Birke, R. L., Lu, T. & Xu, J. Charge transfer theory of surface enhanced Raman spectroscopy: Herzberg–Teller contributions. J. Chem. Phys. 84, 4174–4180 (1986).
Bellessa, J., Bonnand, C., Plenet, J. C. & Mugnier, J. Strong coupling between surface plasmons and excitons in an organic semiconductor. Phys. Rev. Lett. 93, 036404 (2004).
Helmchen, F. & Denk, W. Deep tissue two-photon microscopy. Nature Methods 2, 932–940 (2005).
Hoffmann, G., Berndt, R. & Johansson, P. Two-electron photon emission from metallic quantum wells. Phys. Rev. Lett. 90, 046803 (2003).
Uemura, T. et al. Local-plasmon-enhanced up-conversion fluorescence from copper phthalocyanine. Chem. Phys. Lett. 448, 232–236 (2007).
Maher, R. C., Galloway, C. M., Le Ru, E. C., Cohen, L. F. & Etchegoin, P. G. Vibrational pumping in surface enhanced Raman scattering (SERS). Chem. Soc. Rev. 37, 965–979 (2008).
Zheludev, N. I., Prosvirnin, S. L., Parasimakis, N. & Fedotov, V. A. Lasing spaser. Nature Photon. 2, 351–354 (2008).
The authors acknowledge discussions with B. Wang and X.P. Wang, and support from the National Basic Research Program of China (grant nos 2006CB922003 and 2010CB923300), the Chinese Academy of Sciences (grant no. KJCX2.YW.H06) and the Natural Science Foundation of China (grant nos 10574117 and 10974186).
The authors declare no competing financial interests.
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Dong, Z., Zhang, X., Gao, H. et al. Generation of molecular hot electroluminescence by resonant nanocavity plasmons. Nature Photon 4, 50–54 (2010). https://doi.org/10.1038/nphoton.2009.257
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