Tunneling-Current-Induced Light Emission from Copper Phthalocyanine Thin Films

Takafumi Uemura; Masako Furumoto; Takeshi Nakano; Megumi Akai-Kasaya; Masakazu Aono; Akira Saito; Yuji Kuwahara

doi:10.1380/ejssnt.2006.559

Conference -ISSS-4-

Tunneling-Current-Induced Light Emission from Copper Phthalocyanine Thin Films

Takafumi Uemura, Masako Furumoto, Takeshi Nakano, Megumi Akai-Kasaya, Masakazu Aono, Akira Saito, Yuji Kuwahara

Author information

Takafumi Uemura
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
Masako Furumoto
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
Takeshi Nakano
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
Megumi Akai-Kasaya
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
PRESTO, Japan Science and Technology Agency, Japan
Masakazu Aono
Nanoscale Quantum Conductor Array Project, ICORP, JST, Japan
Harima Institute, RIKEN, Japan
Nanomaterials Laboratory, National Institute for Materials Science, Japan
Akira Saito
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
Nanoscale Quantum Conductor Array Project, ICORP, JST, Japan
Harima Institute, RIKEN, Japan
Yuji Kuwahara
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Japan
Nanoscale Quantum Conductor Array Project, ICORP, JST, Japan
Harima Institute, RIKEN, Japan

Keywords: Scanning tunneling microscopy, Photon emission, Polycrystalline thin films, Phthalocyanine, Plasmons

JOURNAL FREE ACCESS

2006 Volume 4 Pages 559-562

DOI https://doi.org/10.1380/ejssnt.2006.559

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Abstract

Molecular fluorescence induced by tunneling electrons from a scanning tunneling microscope was investigated for copper phthalocyanine thin films deposited on the highly ordered pyrolytic graphite and the Au(111) substrates. No light emission was observed from the copper phthalocyanine thin films on the highly ordered pyrolytic graphite substrate, on the other hand, the fluorescence of copper phthalocyanine on the Au(111) substrate was observed with plasmon-mediated light emission related to the Au(111) substrate. These results are due to the differences in the charge injection efficiency and surface plasmon resonance mode of two substrates. The obtained fluorescence did not satisfy the quantum cutoff condition, that is, observed photon energy was higher than the energy of injected electrons. [DOI: 10.1380/ejssnt.2006.559]

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