Eu^(3+)掺杂铝硅酸钾发光材料的合成及性能研究

Synthesis and Luminescent Properties of KAlSiO_4: Eu^(3+) Phosphor

采用固相法在较温和的反应温度下合成了Eu3+掺杂铝硅酸钾发光材料,利用粉末X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热分析仪(TG-DTA)、紫外-可见光谱、荧光光谱仪(PL)等手段对合成的样品进行表征。结果表明:在450,550,650,750℃下合成的KAlSiO4:Eu3+为无定形态,但其形貌受温度的影响较大,450℃下合成的样品分散性较好,其他温度下得到样品的形貌为块状团聚体;在394 nm的紫外光激发下,样品主要表现出掺杂Eu3+的特征发射(5D0→7F1和5D0→7F2跃迁),在650℃合成的样品的发射光谱强度最强,其荧光衰减曲线符合双指数衰减行为,经拟合平均荧光寿命为0.40 ms。

Eu3 ＋ Abstract： KAlSiO4 ： phosphor was prepared by solid state method. The obtained sample was characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, thermogravimetry-differential thermal analysis （TG-DTA）, photoluminescence （PL） spectra. The results indicated that KAlSiO4：Eu3＋ phosphor had an amor-phous phase. The morphology of the sample was transformed from dispersed nanoparticles to irregular aggregates. Eu3 ＋ Under the excitation of UV light, KAlSiO4 ： phosphor exhibited characteristic emission of the doping Eu3＋ ions. The luminescent decay curve could be well fitted into a double exponential function and the average lifetime for Eu3＋ was determined to be 0. 40 ms.