水热法制备的Li4-3xEux(MoO4)2微晶及其发光性能

采用水热法制备了Li_4-3xEu_{x(MoO4)2系列红色荧光粉.通过X射线衍射(XRD)、扫描电镜(SEM )和荧光分析(FL)对产物的微结构、形貌和发光性能进行表征分析.XRD分析表明,制备的Li4-3xEux(MoO4)2微晶均为白钨矿四方结构.SEM结果显示:随着x的增大,Li4-3xEux(MoO4)2微晶的晶粒尺寸相应减小,在0.2~0.5 μm之间变化.荧光分析结果表明:源于Eu³⁺的⁵D0→⁷F2和⁵D0→⁷F1电荷转移的592 nm和614 nm的特征发射峰显现明显,后者的发射强度远远大于前者.随着x的增大,样品中Eu³⁺的两个特征发射峰的强度先增大后减小,在x=1.0时达到最大.}

Hydrothermal Synthesis and Luminescent Properties of Li4-3xEux(MoO4)2 Microcrystallines

Li_4-3xEu_{x(MoO4)2 microcrystallines were synthesized by hydrothermal method. The crystal structure, surface morphology and room temperature photoluminescence properties of the microcrystallines were investigated by X-ray powder diffraction (XRD), scanning electron micrograph (SEM) and fluorescence analysis (FL), respectively. XRD results confirm that the obtained Li4-3xEux(MoO4)2 microcrystallines are all typical scheelite structure with tetragonal symmetry. SEM images show that the grain size of Li4-3xEux(MoO4)2 microcrystalline decreases with the increasing of x, varies in the range of 0.2-0.5 μm. Fluorescence analysis results reveal that the two strong emission peaks attribute to the transitions of ⁵D0→⁷F2 and ⁵D0→⁷F1 of Eu³⁺ ion (located at 592 nm and 614 nm ) appear obviously, and the emission intensity of the latter is much higher than that of the former. With the increasing of x, the emission intensity of the two characteristic emission peaks of Eu³⁺ ion initially increase, reach the maximum at 1.0, and then decrease.}