Abstract
KSr(Gd,Y)(PO4)2: Tb3+ phosphors were synthesized using the high‐temperature solid‐state reaction method. The VUV–UV spectroscopic properties of these phosphors were studied. The results show that efficient energy transfer (ET) from Gd3+ to Tb3+ occurs in this system, and the ET efficiency increases with increasing of Tb3+ doping concentrations, which is evidenced that both the emission intensity and decay time of Gd3+ decreases with increasing Tb3+ doping concentrations. Visible quantum cutting via cross relaxation between the neighboring Tb3+ ions was observed in the high Tb3+ concentration doped sample. In addition, the emission color of KSr(Gd,Y)(PO4)2: Tb3+ phosphors can be tuned from blue to yellowish‐green by varying the doping concentration of Tb3+. Under 147 nm excitation, the sample KSrGd0.5(PO4)2: 0.5Tb3+ exhibits the strongest emission, which is about 70% of the commercial green‐emitting phosphor Zn2SiO4: Mn2+ indicating the potential application of this phosphor for plasma display panels, Hg‐free lamps, and three‐dimensional displays.
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