Abstract
A new series of gallozincates LnBaZn 3GaO 7 ( Ln=La, Nd, Sm, Eu, Gd, Dy, Y) and new aluminozincates LnBaZn 3AlO 7 ( Ln=Y, Eu, Dy) have been synthesized. Their structure refinements show that these phases belong to the “114” series, with hexagonal P6 3 mc space group previously described for SmBaZn 3AlO 7. The photoluminescence study of these oxides shows that the Eu 3+ activated LnBaZn 3MO 7 oxides with Ln=Y, La, Gd; and M=Al, Ga exhibit strong magnetic and electric dipole transitions (multiband emission) which is of interest for white light production. These results also confirm that the site occupied by Eu 3+ is not strictly centrosymmetric. The electric dipole transition intensity is the highest in GdBaZn 3 MO 7 [ M=Al, Ga]: 0.05Eu 3+ as compared with other Eu 3+ activated compositions. This is due to the layer distortion around GdO 6 octahedra when compared with YO 6 and LaO 6 octahedra.
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