title: STM-induced light emission from thin films of perylene derivatives on the HOPG and Au substrates.
abstract: We have investigated the emission properties of N,N'-diheptyl-3,4,9,10-perylenetetracarboxylic diimide thin films by the tunneling-electron-induced light emission technique. A fluorescence peak with vibronic progressions with large Stokes shifts was observed on both highly ordered pyrolytic graphite (HOPG) and Au substrates, indicating that the emission was derived from the isolated-molecule-like film condition with sufficient π-π interaction of the perylene rings of perylenetetracarboxylic diimide molecules. The upconversion emission mechanism of the tunneling-electron-induced emission was discussed in terms of inelastic tunneling including multiexcitation processes. The wavelength-selective enhanced emission due to a localized tip-induced surface plasmon on the Au substrate was also obtained.
authors.affiliation: Department of Precision Science & Technology, Graduate school of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan. fujiki@ss.prec.eng.osaka-u.ac.jp.
authors.forename: Aya
authors.initials: A
authors.lastname: Fujiki
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Miyake
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Oshikane
authors.forename: Megumi
authors.initials: M
authors.lastname: Akai-Kasaya
authors.forename: Akira
authors.initials: A
authors.lastname: Saito
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kuwahara