Abstract
Tb3+-doped Na3YSi2O7 phosphors were prepared by the sol–gel method and then characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy, and cathodoluminescence spectroscopy. The XRD results reveal that the Tb3+ ions have been introduced as dopants into the Na3YSi2O7 host lattice. Under low-voltage electron beam excitation, the phosphors exhibit the characteristic emissions of Tb3+ (5D3,4→7FJ, J=3–6 transitions). The luminescence color of the phosphors can be tuned from greenish-blue to bluish-green and to green by controlling the Tb3+ concentration within the 0.0005–0.15 (x value). The optimum Tb3+ doping concentration is 10 mol%, and the “dead voltage” is approximately 1.35 kV. All results indicate that the sample is a phosphor candidate for field-emission displays.
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