Nanoscale organic electroluminescence from tunnel junctions

X. L. Guo, Z. C. Dong, A. S. Trifonov, K. Miki, Y. Wakayama, D. Fujita, K. Kimura, S. Yokoyama, S. Mashiko

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Nanoscale organic electroluminescence was induced by positioning a sharp tungsten tip on the surface of a free-base porphyrin (H2TBPP) monolayer on the top of PtTBP porphyrin (PtTBPP) multilayers on a Cu(100) substrate in an ultrahigh vacuum scanning tunneling microscope (STM) system. The well-defined molecular fluorescence spectra are perfectly matched with the conventional photoluminescence spectrum from bulk H2TBPP molecules. The nanoscale PtTBPP multilayers do not fluoresce; rather, they act as spacers to enhance the decoupling of the electronic state of the H2TBPP monolayer from the Cu surface. The electronic property of molecules and the energy-level alignment of molecules with respect to the Fermi levels of electrodes are probably quite critical for observing STM-induced molecular fluorescence from molecular layers with a similar thickness. The molecule in proximity to the tip apex of a scanning tunneling microscope is locally excited by the hot electron injection mechanism, followed by radiative decay via Franck-Condon transitions.

Original languageEnglish
Article number233204
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number23
DOIs
Publication statusPublished - Dec 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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