Abstract
In this study, a series of well dispersed (La1-xDyx)2W2O9 and (La0.98-yGdyDy0.02)2W2O9 phosphors were selected synthesized by co-precipitation and subsequent calcination, where the effects of RE3+:WO42- molar ratio and solution pH were investigated. The triclinic (La1-xDyx)2W2O9 exhibited a series of sharp emission peaks assigned to 4F9/2→6H15/2, 6H13/2, 6H11/2, 6H9/2 transitions of Dy3+, with the 575 nm (4F9/2→6H13/2) emission being the strongest under the excitation of 350 nm. The optimal Dy3+ concentration was determined to be 2 at%. Gd3+ co-doping apparently affect the phase and luminescence of the final product. The product undergoes a phase transformation from triclinic to monoclinic when Gd3+ doping level is over 25 at%. The emission intensity, quantum yield, color purity, and thermal stability of the (La0.98Dy0.02)2W2O9 phosphor were comprehensively enhanced by Gd3+ co-doping and favorable quantum efficiency of 51.23% was obtained.
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