Abstract
Gd3+ and Tb3+ co-doped MgY4Si3O13 green phosphors were prepared by a solid-state reaction. The photoluminescence properties in vacuum ultraviolet–visible (VUV–vis) range and decay properties were investigated in details. The f–d transition of Gd3+ ions and spin-allowed f–d transition of Tb3+ ions locate at about 134nm and 239nm, respectively. Two charge transfer bands of O2−→Gd3+ and O2−→Tb3+ overlap at about 155nm. Some f–f transition of Tb3+ and Gd3+ ions are confirmed in VUV–vis range. Upon excitation at 172nm, the optimal composition of MgY3.3Si3O13:0.5Gd3+, 0.2Tb3+ phosphor exhibits the characteristic transitions of Gd3+ and Tb3+ with chromaticity coordinate of (0.2849, 0.5843). The phosphor has a shorter decay time (2.13ms) than that of Zn2SiO4:Mn2+ (4.56ms). The results suggest that this green phosphor is a potential candidate for mercury-free luminescence lamps and plasma display panels (PDPs) application.
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