RESUMO
The green emitting phosphor, Gd2Ba3B3O12:Tb3+ was synthesized with the method of high-temperature solid-state reaction. The phase structure and photoluminescence (PL) properties of the samples were characterized by The X-ray diffraction (XRD), vacuum ultraviolet spectrum and ultraviolet spectrum (VUV-UV). The results indicate that Tb3+ ion acting as the luminescent center inhabited the site of Gd3+ ion in the host of Gd2Ba3B3O12. The VUV-UV excitation spectrum consists of the two strong broad bands at about 160-200 and 200-250 nm and sharp lines at about 260-280 and 300-320 nm. The two strong broad bands were assigned to the host absorption and f--d transition of Tb3+. The sharp lines were ascribed to the f--f transition of Tb3+ and Gd3+. All the samples of Gd2Ba3B3O12:Tb3+ exhibit strong green emission corresponding to (5)D4-->(7)F5 transition (543 nm) of Tb3+ under VUV-UV light excitation. Under 172 nm excitation, 15 mol% Tb3+ doped Gd2Ba3B3O12 sample exhibits strong green emission with good color purity (x = 0.3136, y = 0.4843) and a fitted a decay time r around 2.98 ms. It can be concluded that this series of phosphors Gd2Ba3B3O12:Tb3+ is a promising green vacuum ultraviolet (VUV) phosphor for plasma display panels (PDPs) and Hg-free fluorescent tubes application.