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It is shown that Gd(B02)5 is an excellent host lattice to obtain efficient VUV excited photoluminescent materials at room temperature. The introduction of Gd3° ions in the lanthanum metaborate host lattice increases both the ionicity of the metal-ligand bonding and the energy transfer rate between the host and the activator. InfroductionThe development of industrial applications in lighting and flat color screen display has induced new investiga-

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