Li+掺杂浓度对Sr3ZnNb2O9:Eu3+荧光粉发光特性的影响

Li⁺作为电荷补偿剂可以提高Sr₃ZnNb₂O₉:Eu³⁺荧光粉的发光强度和热稳定性。本文通过高温固相反应成功制备了Sr₃ZnNb₂O₉:xEu³⁺,yLi⁺(0≤x≤0.5,0≤y≤0.5)荧光粉,为了鉴定和描述样品的物相、发光特性和热稳定性,进行了XRD和发光光谱测试。结果表明:Eu³⁺和Li⁺已经成功掺入到基质材料中,并取代Zn²⁺位点;Li⁺的最佳掺杂浓度为0.3(摩尔分数),浓度猝灭类型是在最近邻离子之间;掺杂Li⁺提高了荧光粉的热稳定性,活化能为0.193 eV,CIE色坐标为(0.651,0.349),非常接近国际照明委员会规定的标准色坐标。

Effect of Li+ Doping Concentration on Luminescence Characteristics of Sr3ZnNb2O9:Eu3+ Phosphor

Li⁺ can improve the luminous intensity and thermal stability of Sr₃ZnNb₂O₉:Eu³⁺ phosphor as a charge compensator. In this work, a series of Sr₃ZnNb₂O₉∶xEu³⁺, yLi⁺ (0≤x≤0.5, 0≤y≤0.5) phosphors were synthesized by high-temperature solid-phase reaction. In order to identify and describe the phase, luminescence characteristics and thermal stability of samples, XRD and luminescence spectra tests were carried out. The results show that the Eu³⁺ and Li⁺ are successfully incorporated into the matrix material and replaced Zn²⁺ sites. The optimal doping concentration of Li⁺ is 0.3 (mole fraction), and the type of the concentration quenching mechanism is between the nearest neighbor ions. The Li⁺ doping improves the thermal stability of phosphors. The activation energy is 0.193 eV, and the CIE color coordinate is (0.651, 0.349), which is very close to the standard color coordinate specified by the International Commission on Illumination.