In-situ chemical co-precipitation composition of hybrid precursors and luminescence of Y1-xGdNbO4:: RE3+, (RE = Tb, Eu) micron crystalline phosphors

In this paper, firstly Tb3+/Eu3+-doped Y1-x,Gd-x,NbO4 phosphors with different ratio of Y to Gd have been synthesized by the in-situ co-precipitation assembly of hybrid precursors. Luminescent spectra of these phosphors have been investigated in order to examine the host matrix compositional effects on the photoluminescent behaviors. The red emission (D-5(0)-F-7(2)) intensity of Eu3+, was the strongest, and so was the green emission (D-5(4)-F-7(5)) intensity of Tb3+. Furthermore, the relative intensity ratio of D-5(0)-F-7(2) to D-5(0)-F-7(6), (Eu3+) or D-5(4)-F-7(5) to D-5(4)-F-7(6) (Tb3+) in all compounds are different due to the different environment of Eu3+ or Tb3+. Phase and particle size of prepared samples were characterized by X-ray diffraction, scanning electric microscope, indicating that the resultant samples present good crystalline state and crystalline grain sizes in the range of micrometer. (c) 2007 Elsevier B.V. All rights reserved.