title: [Cathodoluminescent properties of Na2GdPO4F2:Tb3+ green phosphors].
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%.
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China. lisongbo@imust.cn
authors.forename: Song-bo
authors.initials: SB
authors.lastname: Li
authors.forename: Wen-yu
authors.initials: WY
authors.lastname: Zhao
authors.forename: Bin
authors.initials: B
authors.lastname: Fan
authors.forename: Sheng-li
authors.initials: SL
authors.lastname: An