稀土磷钒酸盐微纳米发光材料的制备及性能研究
发布时间：2018-10-14 15:07
【摘要】：稀土钒酸盐发光材料在紫外光的照射下能较好地吸收并能将能量有效地传递给稀土活性离子,进而发出不同活性离子的特征光谱。用磷酸根替代部分钒酸根形成的磷钒酸盐固溶体作为荧光粉的基质材料,能够提高荧光粉的发光强度、量子效率及稳定性。本论文采用水热法合成了具有新型结构和形貌的稀土磷钒酸盐发光材料(如核-壳,纳米棒状堆簇,纳米片状堆簇的类球状结构),考察了合成参数和反应条件对材料结构和形貌的影响,研究了其自组装微米球的生长机理和发光性能。获得了以下主要的研究结果。采用水热法合成了四方相结构的稀土磷钒酸钇固溶体,研究了P/V摩尔比.EDTA的量、溶液pH值、不同络合剂和反应时间对样品结构和形貌的影响。在P/V=3/7、 EDTA=4 mmol、母液pH值为0.57-1的反应条件下,在180℃水热晶化24 h,合成了球形的四方相的固溶体。以YP0.3V0.7O4微米球为基质,引入不同的稀土离子(Eu、Sm、Dy和Tm),在紫外光的照射下,样品呈现出不同的颜色。考察了猝灭浓度、荧光寿命以及量子效率。结果发现,YP0.3V0.704:Sm3+荧光粉具有较长的荧光寿命和高的量子效率。在YPxV1-xO4基质里掺杂Dy3+和x=0.4～0.6时,制备的材料呈现白光。随着产物中P含量的逐渐增加,Dy3+的发射强度也在逐渐增大,量子效率可达92%。用EDTA和络合剂PVP双配体的作用下,用水热法制备了核壳结构的四方相磷钒酸钇材料。通过对反应参数的调控,制得了不同尺寸和形貌的YP0.3V0.7O4荧光粉。当溶剂的水/乙醇为5：3时,制备的颗粒粒径为500 nm。掺杂稀土活性离子(Eu和Dy),得到样品的猝灭浓度分别为5%和3%。
[Abstract]:Rare earth vanadate luminescent materials can absorb and transfer energy effectively to rare earth active ions under ultraviolet light, and then emit characteristic spectra of different active ions. The phosphovanadate solid solution formed by replacing some vanadate with phosphate can improve the luminescence intensity, quantum efficiency and stability of phosphor. In this paper, a novel structure and morphology of rare earth phosphovanadate luminescent materials, such as core-shell, nanorod clusters, were synthesized by hydrothermal method. The effects of synthesis parameters and reaction conditions on the structure and morphology of the nanoclusters were investigated. The growth mechanism and luminescence properties of the self-assembled microspheres were studied. The following main results are obtained. The tetragonal phase structure solid solution of yttrium phosphate vanadate was synthesized by hydrothermal method. The effects of the molar ratio of P / V, pH value of solution, different complexing agent and reaction time on the structure and morphology of the sample were studied. A spherical tetragonal solid solution was synthesized by hydrothermal crystallization at 180 鈩，
本文编号：2270832
[Abstract]:Rare earth vanadate luminescent materials can absorb and transfer energy effectively to rare earth active ions under ultraviolet light, and then emit characteristic spectra of different active ions. The phosphovanadate solid solution formed by replacing some vanadate with phosphate can improve the luminescence intensity, quantum efficiency and stability of phosphor. In this paper, a novel structure and morphology of rare earth phosphovanadate luminescent materials, such as core-shell, nanorod clusters, were synthesized by hydrothermal method. The effects of synthesis parameters and reaction conditions on the structure and morphology of the nanoclusters were investigated. The growth mechanism and luminescence properties of the self-assembled microspheres were studied. The following main results are obtained. The tetragonal phase structure solid solution of yttrium phosphate vanadate was synthesized by hydrothermal method. The effects of the molar ratio of P / V, pH value of solution, different complexing agent and reaction time on the structure and morphology of the sample were studied. A spherical tetragonal solid solution was synthesized by hydrothermal crystallization at 180 鈩，
本文编号：2270832
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