Abstract
A series of Eu3+-activated Na0.5Gd0.5MoO4 phosphors were prepared by a typical sol–gel method. The as-prepared samples possessed a single tetragonal phase and consisted of closely-packed particles. Under the excitation of 395nm, all the phosphors exhibited the characteristic emissions of Eu3+ ions corresponding to the 5D0→ 7FJ transitions. The photoluminescence (PL) emission intensities were enhanced with the increment of Eu3+ ion concentration and the optimum doping concentration was 0.25mol. The energy transfer mechanism between the Eu3+ ions was dominated by dipole–dipole interaction and the critical distance was found to be 8.45Å. Furthermore, the temperature-dependent PL emission spectra suggested that the obtained phosphors had good thermal stability (60.4% of the initial intensity at 150°C). In addition, the color purity, chromatic and cathodoluminescence (CL) properties of the Na0.5Gd0.5MoO4:0.25Eu3+ phosphor were also investigated. The results indicated that the Eu3+-activated Na0.5Gd0.5MoO4 phosphors with excellent PL and CL properties may have potential applications in white light-emitting diodes and field-emission displays.
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