NaY(MoO_4)2:Eu~(3+) and NaY_(0.9)Bi_(0.1)(MoO_4)_2:Eu~(3+) submicrometer phosphors: Hydrothermal synthesis assisted by room temperature-solid state reaction, microstructure and photoluminescence

摘要

NaY(MoO_4)2:Eu~(3+) and NaY_(0.9)Bi_(0.1)(MoO_4)_2:Eu~(3+) submicrometer phosphors have been synthesized by a composite technology involving hydrothermal process assisted solid state reaction at room temperature. It is revealed that crystalline water is necessary for the solid phase reaction at room temperature. The XRD patterns indicate that both NaY(MoO_4)2:Eu~(3+) and NaY_(0.9)Bi_(0.1)(MoO_4)_2:Eu~(3+) submicrometer phosphors crystallize well with the scheelite structure. Both SEM and TEM images illustrate that the average grain size of NaY(MoO_4)2:Eu~(3+) and NaY_(0.9)Bi_(0.1)(MoO_4)_2:Eu~(3+) is about 200nm without conglomeration. The luminescent lifetimes and quantum efficiencies for NaY(MoO_4)2:Eu~(3+) and NaY_(0.9)Bi_(0.1)(MoO_4)_2:Eu~(3+) are determined, indicating that the introduction of Bi~(3+) is favorable for the luminescence of Eu~(3+).