Light emission from PTCDA bilayer on Au(111) induced in scanning tunneling microscopy

Izabela I. Rzeźnicka, Taro Yamada, Maki Kawai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We studied the light emission induced by tunneling electrons of scanning tunneling microscopy (STM) from well-defined 3,4,9,10-perylenetertracarboxylic dianhydride (PTCDA) bilayer, vapor deposited under ultrahigh vacuum condition on Au(111) single crystal surface. We detected visible fluorescence over the second layer of PTCDA. The light emission spectrum contained a fluorescence peak at 1.75 eV of photon energy at STM bias voltages below 2.5 V. When the bias voltage was set above 2.5 V, another fluorescent peak was observed at 2.35 eV. This peak is out of the range of Au local plasmon excitation, and is attributed to the transition from S1 excited state to S0 ground state of PTCDA molecule excited by direct electron injection. The fluorescence near 2.35 eV was reported in dilute solution of PTCDA by optical excitation. This intrinsic molecular fluorescence indicates that the 2nd layer PTCDA molecules were significantly isolated from environment over the presence of the 1st layer on Au(111).

Original languageEnglish
Pages (from-to)2032-2037
Number of pages6
JournalSurface Science
Volume605
Issue number23-24
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • Au(111)
  • Light emission
  • PTCDA
  • STM

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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