Gigantic electric dipole moment of organic microcrystals evaluated in dispersion liquid with polarized electroabsorption spectra

Hung Chu Chiang, Toshifumi Iimori, Tsunenobu Onodera, Hidetoshi Oikawa, Nobuhiro Ohta

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    Polarized electroabsorption spectra of the 4-N,N-dimethylamino-4'-N'- methyl-stilbazolium tosylate (DAST) microcrystal, which is well-known as an organic nonlinear optical material, were measured in decalin liquid using electric-field modulation spectroscopy. On the basis of the results, the magnitude of the electric dipole moment in the ground state of DAST microcrystals whose size was about 0.35 μm was determined to be as large as ∼4.5 × 10 4 D, and the magnitude of the difference in the dipole moment between the ground state and excited state was estimated to be ∼2.5 × 10 3 D, though the local field correction was not made. The transition moment of the DAST crystal was also found to be a little affected by application of electric fields.

    Original languageEnglish
    Pages (from-to)8230-8235
    Number of pages6
    JournalJournal of Physical Chemistry C
    Volume116
    Issue number14
    DOIs
    Publication statusPublished - 2012 Apr 12

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

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