Spectral investigations on niobium and rare earth activated yttrium tantalate powders
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS(2008)
摘要
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, Nb205. 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)O-4: 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.
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关键词
yttrium tantalate,yttrium niobate,phosphors,rare earth,luminescence
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