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  • Title: [Cathodoluminescent properties of Na2GdPO4F2:Tb3+ green phosphors].
    Author: Li SB, Zhao WY, Fan B, An SL.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2011 May; 31(5):1181-4. PubMed ID: 21800559.
    Abstract:
    The green emitting phosphors, Na2GdPO4F2:Tb3+, was synthesized by high temperature solid-state method. X-ray diffraction (XRD) and cathodoluminescence (CL) spectrum were used to characterize the samples. Under the low-voltage electron beam (0.5 - 5 kV) excitation, the Tb3+-doped Na2GdPO4F2 phosphor showed a very strong green emission corresponding to the characteristic transitions of Tb3+ (5D3,4 --> F(J) transitions, J = 6 - 2) with the strongest emission at 546 nm, corresponding to 5D4 --> F5 of Tb3+. The cathodoluminescent color of Na2Gd0.95Tb0.05PO4F2 was green to the naked eye with the Commission International de l'Eclairage (CIE) coordinates of x = 0.2403, y = 0.4386, and the color temperature at about 8634.3 K. The CL intensity increases upon raising the accelerating voltage, filament current and the doping concentrations, thereinto, the optimal concentrations of Tb3+ is 10 mol%.
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