Gd2(MoO4)3:Tb3+荧光粉的固相合成与光谱性质

以MoO3、Gd2O3及Tb4O7为原料,以NH4HF2为助溶剂,在碳粉还原条件下制备了不同Tb3+掺杂浓度的Gd2( MoO4)荧光粉样品.采用X射线衍射(XRD)对样品的晶体结构进行了表征,发现掺杂浓度的改变未对产物的晶体结构产生影响,产物均为单一正交相Gd2( MoO4)3.对样品的激发、发射光谱及荧光衰减特性进...

Solid State Reaction Synthesis and Spectroscopic Propertiesof Gd2（MoO4）3∶Tb3+ Phosphor

Tb³⁺ doped Gd₂(MoO₄)₃ phosphors were prepared by using MoO₃, Gd₂O₃ and Tb₄O₇ as starting materials via a solid state reaction with flux of NH₄HF₂. The X-ray diffraction was used to characterize the crystal structure of the final resultants. It was found that the products exist in orthorhombic phase with space group Pba2. Excitation and emission spectra indicated that the studied phosphors can absorb 200~300 nm lights, which corresponding to both the f-d and Mo-O transitions, and emit blue broad band and green narrow lines originate from MoO₄^2- and f-f transitions, respectively. Meanwhile, the concentration quenching and fluorescence decays were also studied, and it was found that in the case of taking carbon powder as reductant, Tb₄O₇ can not be well reduced. The color coordinates for the phosphors various with Tb³⁺ concentrations, and that the color purity for the phosphors are not good. From the obtained results, it can be concluded that this phosphor is not a promising one for the practical applications.