Luminescence lifetime of lanthanide(III) ions in aqueous solution containing azide ion

JOURNAL OF ALLOYS AND COMPOUNDS

卷:323

Article; Proceedings Paper

Lis, S ; Kimura, T ; Yoshida, Z

关键词: azide;    lanthanide(III) ions;    luminescence lifetime;    quenching rate constants;   

DOI  :  10.1016/S0925-8388(01)00980-X

来源: Elsevier

【 摘 要 】

Luminescent lanthanide ions have been studied using Time-Resolved Laser-induced Luminescence Spectroscopy. The luminescence lifetimes, tau, of excited states of several trivalent lanthanide (Ln(3+)) ions (Ln=Nd, Sm, Eu, Gd, Tb and Dy) in aqueous solution, containing azide ion (N-3(-)), have been measured to evaluate the quenching effect of N-3(-). The luminescence decay constants k(obs) of Ln(3+) (Ln=Nd, Sm, Eu, Gd, Tb and Dy) were measured in H2O solution, and in the case of Eu3+ also in D2O solution. The calculated values of the decay constants indicate that, under the conditions of this work, N-3(-) strongly quenches the excited states of Gd3+, Eu3+ and Tb3+. The order of the energy gap, DeltaE, between the emitting and the ground state of the Ln(3+) ion is Gd > Tb > Eu, while that of the quenching rate constants by azide, k(N3), show the following order: Gd > Eu > Tb. In the case of Nd3+, Sm3+ and Dy3+ no quenching effect was observed. (C) 2001 Elsevier Science B.V. All rights reserved.

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