Luminescence properties of sol-gel derived silica gels doped and undoped with RE-complexes(RE=Eu, Tb)

Document Type

Article

Publication Date

1-1-1997

Abstract

The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)3 and Tb(o-CBA)3 (TTA=thenoyltrifluocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+5D0 →7 FJ (J=0,1,2,3,4), Tb3+5D4 →7 FJ (J=3,4,5,6) transitions. Compared with the pure RE-complexes powder, the silica gels doped with RE-complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 μs) in silica gel doped with Tb(o-CBA)3 than in pure Tb(o-CBA)3 powder (744 μs). The reasons responsible for these results are discussed in the context.

Publication Source (Journal or Book title)

Chinese Journal of Chemistry

First Page

327

Last Page

335

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