采用水热法制备了Li4-3xSmx(WO4)2系列绿色荧光粉。通过扫描电镜、X射线衍射和荧光光谱等手段研究所得粉体形貌、结构和发光性能,分析了Sm3+变化对样品形貌和发光性能的影响。结果表明:所有Li4-3xSmx(WO4)2系列微晶样品均为四方晶系、白钨矿结构,该荧光粉可被蓝光(450nm)有效激发,最强发射波长位于568nm,获得高亮度绿光。随着x的增大,样品中Sm3+的568nm和664nm两个特征发射峰的强度先增大后减小,当x=0.4时达到最大。
Li4-3xSmx(WO4)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 confirmed that the obtained Li4-3xSmx(WO4)2 microcrystallines all were typical scheelite structure with tetragonal symmetry.Fluorescence analysis results revealed that these phosphors can be effectively excited by blue (450nm) light,emitting the maxium line at 568nm with pure green light.The emission intensity of the two characteristic emission peaks of Sm3+ ion (located at 568nm and 664nm) initially increased,reached the maximum at 0.4,and then decreased with the increasing x.
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