Study on the luminescent properties of Tb3+ doped pyrosilicate phosphor

The Y2Si2O7:Tb3+ phosphor was synthesized by high temperature solid state method. The crystal structure and luminescent properties of phosphors were studied by XRD pattern, excitation and emission spectra in this paper. XRD pattern showed that the sample was single phase Y2Si2O7 crystal and the crystal lattice constants a = 0.806nm, b = 0.934 nm, and c = 0.692 nm. The excitation spectrum is composed of a broad band centered 290nm and three narrow bands corresponding to 4f - 4f transition of Tb3+ centered 378 nm, 400nm and 420nm, respectively. The emission peaks of phosphor were located at 487nm, 546nm, 584nm and 623nm, which were corresponding to D-5(4)-F-7(6), D-5(4)-F-7(5), D-5(4)-F-7(4) and D-5(4)-F-7(3), respectively. The influences of Tb3+ concentration on the luminescent intensity of Y2Si2O7: Tb3+ phosphor was studied. The results indicated that this phosphor could act as a candidate green phosphor for UV-excited white LED.