Novel emission properties of melem caused by the heavy metal effect of lanthanides(III) in a LB film.
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.
Ishii
Ayumi
A
College of Science and Engineering, Aoyama-Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa, Japan.
Habu
Koji
K
Kishi
Shinobu
S
Ohtsu
Hideki
H
Komatsu
Tamikuni
T
Osaka
Keiichi
K
Kato
Kenichi
K
Kimura
Shigeru
S
Takata
Masaki
M
Hasegawa
Miki
M
Shigesato
Yuzo
Y