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

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9544-9552
Number of pages9
JournalJournal of Physical Chemistry A
Volume111
Issue number38
DOIs
Publication statusPublished - 2007 Sep 27
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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