Photoluminescence and local structure of Eu(III)-doped zirconium silicates


Synthetic umbite microporous zirconium silicates doped with different concentrations of Eu3+ are used as phosphorus and as precursor for preparing novel luminescence dense materials, analogues of the mineral wadeite. Both zirconium silicates display a high and stable room temperature emission in the visible spectral region. The number of Stark components detected in Eu3+-doped umbite and in Eu3+-doped wadeite indicates the presence of one and two optically active Eu3+ environments, respectively. From the luminescence features, we inferred that in doped umbite Eu3+ replace K+ located in large eight-membered rings, whereas in Eu3+-doped wadeite one of the sites corresponds to an isomorphous Eu3+/K+ substitution and the other to a replacement of the Zr4+ ions. (C) 2003 Elsevier B.V. All rights reserved.



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Chemistry; Materials Science; Metallurgy & Metallurgical Engineering


Rainho, JP; Ananias, D; Lin, Z; Ferreira, A; Carlos, LD; Rocha, J

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