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Spectral investigations on niobium and rare earth activated yttrium tantalate powders

E. J. POPOVICI1,* , F. IMRE-LUCACI2,1, L. MURESAN1, M. STEFAN1, E. BICA1,2, R. GRECU1, E. INDREA3

Affiliation

  1. Raluca Ripan Institute for Research in Chemistry, Fântânele 30, 400294 Cluj-Napoca, Romania
  2. Faculty of Chemistry and Chemical Engineering, “Babes Bolyai” University, 400084 Cluj-Napoca, Romania
  3. National Institute for R &D of Isotopic and Molecular Technologies, 400295 Cluj-Napoca, Romania

Abstract

Europium and/or terbium activated yttrium tantalate, ytrium niobium-tantalate and yttrium niobate phosphors were prepared by solid state reaction, from homogeneous mixture consisting of Y2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5, and Na2SO4 as flux. Photoluminescence spectroscopy, X-ray diffraction and FTIR spectroscopy were used to investigate the structural and luminescent properties of Y(Ta,Nb)O4: Eu/Tb phosphors. Phosphor powders with variable photoluminescence colours from blue-to-green-to-yellow-to-red were obtained by thermal synthesis. Emission spectra enabled us to put in evidence the energy transfer from the tantalate/niobate host lattice to the rare earth emission centres. A mutual interaction between europium and terbium could be also considered..

Keywords

Yttrium tantalate, Yttrium niobate, Phosphors, Rare earth, Luminescence.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

E. J. POPOVICI, F. IMRE-LUCACI, L. MURESAN, M. STEFAN, E. BICA, R. GRECU, E. INDREA, Spectral investigations on niobium and rare earth activated yttrium tantalate powders, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2334-2337 (2008)