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Novel emission properties of melem caused by the heavy metal effect of lanthanides(iii) in a LB film

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Abstract

A novel emissive molecular system is constructed by the intercalation of the fluorophore melem (triamino-tri-s-triazine) within a Langmuir—Blodgett (LB) film of stearic acid with the periodic arrangement of lanthanides (Ln(iii)), mainly Pr(iii) with supporting of Eu(iii). From emission spectra, decay curves, quantum yields and XPS measurements, it is clarified that the external heavy metal effect of Pr(iii) on melem is much stronger in the film than in the bulk solid state, resulting in producing an unusual triplet state of melem. The triplet state of melem in the LB film donates the excitation energy to Pr(iii) in the LB film, which is completely different from the energy transfer pathway of Pr—melem complex in the solid state through the singlet state of melem.

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Authors and Affiliations

  1. College of Science and Engineering, Aoyama-Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa, 229-8558, Japan

    Ayumi Ishii, Koji Habu, Shinobu Kishi, Hideki Ohtsu, Miki Hasegawa & Yuzo Shigesato

  2. The Noguchi Institute, Asahi Kasei Corporation, 1-8-1 Koga, Itabashi-ku, Tokyo, 173-0003, Japan

    Tamikuni Komatsu

  3. Structural Materials Science Laboratory, RIKEN SPring-8 Centre, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan

    Kenichi Kato & Masaki Takata

  4. Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan

    Keiichi Osaka, Kenichi Kato, Shigeru Kimura & Masaki Takata

  5. CREST, Japan Science and Technology Agency, 4-1-8, Honmachi, Kawaguchi, Saitama, 332-0012, Japan

    Kenichi Kato, Shigeru Kimura & Masaki Takata

Authors
  1. Ayumi Ishii
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  2. Koji Habu
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  3. Shinobu Kishi
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  4. Hideki Ohtsu
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  5. Tamikuni Komatsu
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  6. Keiichi Osaka
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  7. Kenichi Kato
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  8. Shigeru Kimura
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  9. Masaki Takata
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  10. Miki Hasegawa
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  11. Yuzo Shigesato
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Corresponding authors

Correspondence to Miki Hasegawa or Yuzo Shigesato.

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Ishii, A., Habu, K., Kishi, S. et al. Novel emission properties of melem caused by the heavy metal effect of lanthanides(iii) in a LB film. Photochem Photobiol Sci 6, 804–809 (2007). https://doi.org/10.1039/b703751c

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  • DOI: https://doi.org/10.1039/b703751c

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