Crystal size dependence of fluorescence spectra from perylene nanocrystals evaluated by scanning near-field optical microspectroscopy

Hidetoshi Oikawa, Tadashi Mitsui, Tsunenobu Onodera, Hitoshi Kasai, Hachiro Nakanishi, Takashi Sekiguchi

Research output: Contribution to journalLetterpeer-review

54 Citations (Scopus)

Abstract

The fluorescence spectra of perylene nanocrystals, the crystal size of which is in the range of about 300 nm to 1 μm, were measured with the scanning near-field optical microspectroscopy. It has become apparent for the first time that the emission peaks from the self-trapped exciton state were evidently blue-shifted with decreasing crystal size. On the other hand, the emission spectra from the free exciton state were scarcely dependent on crystal size. These spectral changes were discussed semi-quantitatively on the basis of the strong coupling model between excitons and lattice for a molecular crystal. The influence of the substrate was also suggested.

Original languageEnglish
Pages (from-to)L111-L113
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume42
Issue number2 A
DOIs
Publication statusPublished - 2003 Feb 1

Keywords

  • Fluorescence spectrum
  • Free exciton
  • Perylene nanocrystal
  • Reprecipitation method
  • Scanning near-field optical microspectroscopy
  • Self-trapped exciton
  • Size effect

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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