Multiband orange-red photoluminescence of Eu3+ ions in new "114" LnBaZn(3)GaO(7) and LnBaZn(3)AlO(7) oxides

Saradhi, M P and Raveau, B and Caignaert, V and Varadaraju, U V (2010) Multiband orange-red photoluminescence of Eu3+ ions in new "114" LnBaZn(3)GaO(7) and LnBaZn(3)AlO(7) oxides. Journal of Solid State Chemistry, 183 (2). pp. 485-490. ISSN 0022-4596

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Abstract

A new series of gallozincates LnBaZn(3)GaO(7) (Ln=La, Nd, Sm, Eu, Gd, Dy, Y) and new aluminozincates LnBaZn(3)AlO(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 SmBaZn3AlO7. The photoluminescence study of these oxides shows that the Eu3+ activated LnBaZn(3)MO(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 Eu3+ is not strictly centrosymmetric. The electric dipole transition intensity is the highest in GdBaZn3MO7 [M=Al, Ga]: 0.05 Eu3+ as compared with other Eu3+ activated compositions. This is due to the layer distortion around GdO6 octahedra when compared with YO6 and LaO6 octahedra.

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