Optical properties of silylene-biphenylene copolymer films

Makoto Shimizu, Rumiko Ono, Shozo Suto, Takenari Goto, Mao Ching Fang, Akira Watanabe, Minoru Matsuda

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We have measured absorption, photoluminescence, and photoluminescence excitation spectra, and the photoluminescence time response for films of silylene-biphenylene copolymer, ((C6H4)2(Si(CH3)2)m )n with m=1, 2, 4, and 6. The excitation spectra clearly reveal that the lowest absorption band in each copolymer consists of two bands, i.e., a band at 4.7 eV and a band of which energy depends on m. Since the latter band is absent in the copolymer with m = 1, the former band is attributed to the lowest π - π* transition in biphenylene subunits. The latter band is attributed to the lowest σ - σ* transition in the silylene subunits, considering its dependence on m. In contrast to the result for solution, the peak energy of photoluminescence band is independent of m. The band has a Stokes shift of more than 1 eV and a large band width of 0.5 eV. The time responses of photoluminescence intensity consist of more than two decay components and the intensity decays more slowly at smaller energy. The large Stokes shift is explained as due to excimer formation between biphenylene subunits. In order to explain the energy dependence of time responses, energy migration is discussed.

本文言語English
ページ(範囲)197-203
ページ数7
ジャーナルJournal of Luminescence
99
3
DOI
出版ステータスPublished - 2002 10月

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 化学 (全般)
  • 原子分子物理学および光学
  • 凝縮系物理学

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