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Etudes structurales et propriétés de luminescence de nouveaux composés des systèmes Li2O-B2O3-Ln2O3 (Ln = terres rares)

Abstract : The interest in borates has increased in recent years. The (Y,Gd)BO3: Eu3+ compound is currently used in the new plasma display panels as the red phosphor; Li6Ln(BO3)3: Ce3+ (Ln = raren earth) are a new class of scintillators for neutron imaging. In addition to the previously known borates Li6Ln(BO3)3 and Li3Ln2(BO3)3 the investigation of the Li2O-B2O3-Ln2O3 diagrams revealed the existence of four new compositions : the Li3Ln(BO3)2 borates and the LiLn6O5(BO3)3, LiLn2O2BO3 and Li2Ln5O4(BO3)3 oxyborates. All their structures were
solved on single crystals par X-ray diffraction. All oxyborates are characterized by the existence of an
assembly of OLn4 tetrahedra, three-dimensional in LiLn6O5(BO3)3, bidimensional in Li2Ln5O4(BO3)3
and LiLn2O2BO3, the (BO3)3- groups and Li+ ions being accommodated in holes or between the layers
of these sub-lattices.
The luminescent characteristics of trivalent europium, thulium and cerium were studied in order to evaluate their potential use in the previously described applications. Moreover charge transfer emissions of lanthanum and tetravalent cerium were observed.
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Veronique Jubera. Etudes structurales et propriétés de luminescence de nouveaux composés des systèmes Li2O-B2O3-Ln2O3 (Ln = terres rares). Matériaux. Université Sciences et Technologies - Bordeaux I, 2001. Français. ⟨tel-00135418⟩

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