Light emission from porphyrin molecules induced by a scanning tunneling microscope

Zhen Chao Dong, Asit Kar, Zhi Qiang Zou, Taizo Ohgi, Pavel Dorozhkin, Daisuke Fujita, Shiyoshi Yokoyama, Toshifumi Terui, Toshiki Yamada, Toshiya Kamikado, Minniu Zhou, Shinro Mashiko, Takayuki Okamoto

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


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 ∼ 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.

Original languageEnglish
Pages (from-to)4898-4902
Number of pages5
JournalJapanese Journal of Applied Physics
Issue number7 B
Publication statusPublished - Jul 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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