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Excitation transfer between the two sites in the nanometric scale X$_1$-Y$_2$SiO$_5$:Eu

Abstract : We have measured the photoluminescence spectra of nanometric scale X-1-Y2SiO5:Eu-x. The spectra were recorded at 15K and room temperature using site selective excitation by a dye laser in addition to conventional UV excitation. We found that at low temperature there is a pronounced excitation transfer from site 2-->1. The transfer rate increases rapidly with increasing concentration and for x=0.7 no fluorescence from site 2 can be observed. Decaycurve measurement revealed this transfer process directly. The lifetimes of the D-5(0) levels of the two sites were also measured as a function of Eu3+ concentration. The results show that the lifetimes of the D-5(0) level of site 2 decreases with increasing concentration The mechanism of the excitation transfer is discussed. Wavelengths of the D-5(0)-->(?)7D(0-4) transitions of the two sites were also tabulated.
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Contributor : Suzanne Robert <>
Submitted on : Tuesday, April 18, 2000 - 9:47:58 AM
Last modification on : Wednesday, September 16, 2020 - 4:07:23 PM


  • HAL Id : in2p3-00022978, version 1



M. Yin, W. Zhang, L. Lou, S. Xia, J.C. Krupa. Excitation transfer between the two sites in the nanometric scale X$_1$-Y$_2$SiO$_5$:Eu. Spectroscopy Letters, Taylor & Francis, 1998, 31, pp.767-778. ⟨in2p3-00022978⟩



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