Ultrafast dynamical study of self-trapped excitons in ladder type of halogen-bridged Pt complexes

Tohru Suemoto, Youtarou Takahashi, Keizo Yasukawa, Daisuke Kawakami, Shinya Takaishi, Masahiro Yamashita, Atsushi Kobayashi, Hiroshi Kitagawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The properties and the dynamics of the excited states in out-of-phase ladder-type halogen-bridged Pt complexes (Pt-Br-out and Pt-I-out) are studied using femtosecond luminescence spectroscopy. In both materials, Gaussian-shaped broad luminescence bands with large Stokes shifts are found around 0.8 eV and assigned to self-trapped excitons (STE). The wave-packet oscillations with periods of 290 and 306 fs were observed in Pt-Br-out and Pt-I-out, respectively. The higher oscillation frequency in Pt-I-out compared with the one-dimensional (1D)-type Pt-I is ascribed to the smaller lattice relaxation in the ladder system. Although the lifetime of the STE is almost the same as that of the 1D-type Pt-Br, the lifetime in Pt-I-out is one order of magnitude longer than that in the 1D-type Pt-I. This is ascribed to the phase locking of the charge density wave due to the interchain interaction.

Original languageEnglish
Pages (from-to)1081-1083
Number of pages3
JournalJournal of Luminescence
Volume128
Issue number5-6
DOIs
Publication statusPublished - 2008 May 1

Keywords

  • Halogen-bridged
  • One-dimensional
  • Self-trapped exciton
  • Ultrafast luminescence spectroscopy

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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