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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 41, Issue 7B, Pages 4898-4902Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.41.4898
Keywords
scanning tunneling microscopy; photon emission; electroluminescence; tunneling; copper; porphyrin
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Positioning of a scanning tunneling microscope (STM) tip above Cu-tetra-(3,5-di-tertiary-butyl-phenyl)-porphyrin (Cu-TBPP) molecules on Cu(100) is found to induce plasmon-mediated emission and molecular luminescence when bias voltages are above similar to 2.3 V. Optical spectra acquired at a low current of 0.2 nA suggest not only the enhancement effect of the molecules on light emission but also new features associated with the molecules. The quantum efficiency of such light emission excited by inelastic tunneling is on the order of 10(-6) photons per electron.
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