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

Ayumi Ishii, Koji Habu, Shinobu Kishi, Hideki Ohtsu, Tamikuni Komatsu, Keiichi Osaka, Kenichi Kato, Shigeru Kimura, Masaki Takata, Miki Hasegawa, Yuzo Shigesato

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)804-809
Number of pages6
JournalPhotochemical and Photobiological Sciences
Volume6
Issue number7
DOIs
Publication statusPublished - 2007 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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