Electronic Transition Process of Fluorescence Appearing in Various Organic Polymers

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  • Nishikawa Seiya
    Department of Electrical Engineering and Bioscience, Waseda University
  • Tonoi Masashi
    Department of Electrical Engineering and Bioscience, Waseda University
  • Yoshikawa Takeshi
    Department of Chemistry and Biochemistry, Waseda University
  • Hirai Naoshi
    Research Institute for Materials Science and Technology, Waseda University
  • Nakai Hiromi
    Department of Chemistry and Biochemistry, Waseda University
  • Ohki Yoshimichi
    Department of Electrical Engineering and Bioscience, Waseda University Research Institute for Materials Science and Technology, Waseda University

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  • 多くの有機高分子に現れる蛍光の電子遷移過程
  • オオク ノ ユウキ コウブンシ ニ アラワレル ケイコウ ノ デンシ センイ カテイ

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Abstract

Low density polyethylene (LDPE) and polypropylene (PP) exhibit a photoluminescence (PL) band, which emits photons with an energy of around 4.3 eV when excited by photons with energies around 6.4 eV. The origin of this PL band has been assigned to α, β-unsaturated carbonyl. In this paper, the appearance of PL was examined for four kinds of polyolefin and four kinds of biodegradable polymers. As a result, it has become clear that all the polymers show a PL band with a PL excitation spectrum and a PL spectrum similar to those of the above-mentioned PL band in LDPE and PP. The decay profiles observed for these PL bands indicate that they are fluorescence. Furthermore, the intensity of the PL becomes weak for all the four polyolefin samples and the polylatic acid sample if ultraviolet photons were irradiated to the sample. Quantum chemical calculations carried out by assuming a model of α, β-unsaturated carbonyl have revealed that the PL originates in the π* to π transition of electrons in the carbon-carbon double bond.

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