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

doi:10.1039/B703751C

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

Ayumi Ishii,^a Koji Habu,^a Shinobu Kishi,^a Hideki Ohtsu,^a Tamikuni Komatsu,^b Keiichi Osaka,^d Kenichi Kato,^cde Shigeru Kimura,^de Masaki Takata,^cde Miki Hasegawa*^a and Yuzo Shigesato*^a

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^a College of Science and Engineering, Aoyama-Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa, Japan
E-mail: hasemiki@chem.aoyama.ac.jp, yuzo@chem.aoyama.ac.jp
Fax: +81 42 759 6493
Tel: +81 42 759 6221

^b The Noguchi Institute, Asahi Kasei Corporation, 1-8-1 Koga, Itabashi-ku, Tokyo, Japan

^c Structural Materials Science Laboratory, RIKEN SPring-8 Centre, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, Japan

^d Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, Japan

^e CREST, Japan Science and Technology Agency, 4-1-8, Honmachi, Kawaguchi, Saitama, Japan

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.

Photochemical & Photobiological Sciences

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

Abstract

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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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