External electric field effects on absorption, fluorescence, and phosphorescence spectra of diphenylpolyynes in a polymer film

Md Wahadoszamen, Tatsuo Hamada, Toshifumi Iimori, Takakazu Nakabayashi, Nobuhiro Ohta

研究成果: Article査読

22 被引用数 (Scopus)

抄録

External electric field effects on absorption, fluorescence, and phosphorescence spectra of a series of unsubstituted diphenylpolyynes have been examined in a PMMA film. The analysis of the electroabsorption spectra indicates that the shorter diphenylpolyynes exhibit only the change in molecular polarizability, whereas the longer ones exhibit the change both in dipole moment and in molecular polarizability following absorption. The finding of the change in dipole moment following absorption of centrosymmetric diphenylpolyynes is interpreted in terms of the symmetry distortion upon doping a polymer film. When the external electric field is applied, the fluorescence yield is reduced and enhanced, respectively, in diphenylacetylene and diphenyloctatetrayne, indicating that the rate of the nonradiative process from the fluorescence state is accelerated in diphenylacetylene and decelerated in diphenyloctatetrayne by an external electric field. All of the diphenylpolyynes used in the present study exhibit the change in molecular polarizability following the phosphorescence process.

本文言語English
ページ(範囲)9544-9552
ページ数9
ジャーナルJournal of Physical Chemistry A
111
38
DOI
出版ステータスPublished - 2007 9 27
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学

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