阴离子取代合成Sr3LaAxV3-xO12:Eu3+(A=Mo,W)白光荧光粉

通过高温固相法合成Sr₃LaA_xV_3-xO₁₂:Eu³⁺（A=Mo，W）荧光粉，利用MoO₄^2-和WO₄^2-取代基质中部分VO₄^3-，改变基质组成和结构，进而影响基质和激活剂Eu³⁺离子的发光性能。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和荧光分光光度计对所合成样品的物相、形貌、荧光性能及荧光寿命进行表征。研究表明，MoO₄^2-和WO₄^2-的部分掺杂对基质发光位置和强度均有影响，能明显减弱VO₄^3-的发光，但对Eu³⁺离子发光影响不大，添加电荷补偿剂F^-可以加强VO₄^3-对Eu³⁺离子的能量传递。通过调整基质VO₄^3-发光和Eu³⁺离子发光，可以得到单一基质的白光荧光粉。初步探讨了阴离子掺杂对Eu³⁺离子红光发射增强的机理。

Synthesis of Sr3LaAxV3-xO12: Eu3+ (A=Mo,W) White Phosphor by Anion Substitution

Sr₃LaA_xV_3-xO₁₂:Eu³⁺ (A=Mo, W) phosphors were synthesized by a high temperature solid state method. X-ray diffraction(XRD), scanning electron microscopy(SEM), photoluminescence spectra, and lifetime were utilized to characterize the samples. Partial substitution of VO₄^3- by MoO₄^2- and WO₄^2- in Sr₃LaA_xV_3-xO₁₂:Eu³⁺ (A=Mo, W) can weaken the emission of VO₄^3-, and cause a red shift of emission position, but has little influence on the emission of Eu³⁺ ion. After charge compensation by adding F^- in Sr₃LaMo_xF_xV_3-xO₁₂:Eu³⁺, the excitation energy of VO₄^3- can be transferred to Eu³⁺ ion and then enhance the emission of Eu³⁺ ion. A white phosphor of Sr₃LaA_xV_3-xO₁₂:Eu³⁺ (A=Mo, W) can be obtained by adjusting the emissions of the VO₄^3- and Eu³⁺ ions. The enhancement mechanism of the red emission of Eu³⁺ by anion substitution was briefly discussed.