Abstract
A new tungstate family, Li3Ba2Gd3(WO4)8doped with Tb3+is synthesized by using a conventional high-temperature solid-state method to explore new pure green phosphors for white light-emitting diodes (WLEDs). The results from the X-Ray patterns show that the crystal structures of the hosts are composed of tungstate zigzags and the Gd3+-Gd3+units, which are isolated by the [WO4]2-groups. The critical concentration of Tb3+is up to x=2.0 in the singly doped phosphors, which is ascribed to the interaction of the isolated Gd3+ions being mitigated by [WO4]2-groups. The characteristic green emission peaks at around 547 nm are also observed, which result from the5D4→7F5transition of Tb3+ions, and the optimal doping concentration is x=2.0.
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