稀土离子掺杂的氧化镥及钒酸镥的可控合成和发光性质研究
发布时间：2018-12-14 00:06
【摘要】：稀土发光材料作为一种特殊的功能材料具有独特的光、电、磁性能,因而被广泛的应用于照明、显示、生物、医疗等领域。研究表明,材料的性质受到其本身结构的影响,由于纳微米材料具有尺寸小、分散性好、粒度均一等优点引起了研究者们的广泛关注。因此制备性能优异的纳微米级稀土发光材料成为了近年来的研究热点。众所周知,基质的组成和性质会在很大程度上影响发光材料的性能,所以选择合适的基质材料是制备发光性质良好的稀土发光材料的关键。稀土氧化物和钒酸盐具有优异的物理、化学性质,被用作稀土发光材料的基质。此外,稀土氧化物中的电荷迁移带(CTB)及稀土钒酸盐中VO_43-的特征吸收,可以进一步增强稀土离子的发光性质。因此制备出形貌均一、分散性良好的纳微米级稀土氧化物、稀土钒酸盐是研究的热点,此外制备出高效的单一基质的多色发光荧光粉也是研究的一大重点。本论文主要采用简单、环境友好的合成方法制备出一系列形貌可控的纳微米级Lu_2O_3及LuVO_4,并研究了稀土离子掺杂产物的多色发光性能,取得以下研究成果:1、以酒石酸为沉淀剂、水和乙醇作为反应溶剂,利用沉淀法制备出菜花状Lu2(C4H4O6)3·6H2O前驱体,粒径约为2μm。700℃煅烧后即可得到粒径约为1μm的菜花状Lu_2O_3。研究了菜花状结构的形成过程。改变溶剂中水和乙醇的比例即可制备出不同形貌的前驱体(片状、碟状),讨论了不同形貌产物的形成原因。对纳米片及菜花状Lu2(C4H4O6)3·6H2O:Eu~(3+)和Lu_2O_3:Eu~(3+)进行发光性质对比,光谱中均出现了Eu~(3+)的特征发射,此外菜花状结构具有更好的发光效果。进一步研究了菜花状Lu2(C4H4O6)3·6H2O:Tb~(3+)和Lu_2O_3:Tb~(3+)的发光性质,在紫外光的激发下,产物出现较强的绿光发射,归属为Tb~(3+)离子5D4-7FJ的特征跃迁。2、以酒石酸为形貌控制剂,利用溶剂热法制备出3D球形结构的LuVO_4,产物直径为2μm,由纳米片自组装而成。详细研究了酒石酸的量、溶液pH值、反应温度、反应时间对产物形貌的影响,阐明了不同形貌产物(纳米粒子、纳米片、亚微米片、纳米四边形、球形、块状结构)的形成机理。以球形结构LuVO_4为基质,研究了Dy-Eu共掺LuVO_4样品中Dy~(3+)与Eu~(3+)之间的能量传递机理,通过能量传递可以实现样品从黄绿光、橙光到红光的多色光发射。在275 nm(VO_43-特征激发峰)监测下,研究3D球形LuVO_4:Tm-Dy、LuVO_4:Dy-Eu、LuVO_4:Tm-Dy-Eu共掺及三掺样品的发光性质,样品的发射光谱中均出现掺杂离子的特征发射,实现了从蓝光、蓝绿光、黄绿光、橙光到红光,以及白光的多色光发射。
[Abstract]:As a special functional material, rare earth luminescent materials have unique optical, electrical and magnetic properties, so they are widely used in lighting, display, biology, medical and other fields. The study shows that the properties of the materials are affected by their own structure. Due to the advantages of small size, good dispersion and uniform particle size, nanometer-meter materials have attracted extensive attention of researchers. Therefore, the preparation of nanometer-sized rare earth luminescent materials with excellent performance has become a research hotspot in recent years. It is well known that the composition and properties of the matrix will greatly affect the properties of the luminescent materials, so the selection of appropriate matrix materials is the key to the preparation of rare earth luminescent materials with good luminescence properties. Rare earth oxides and vanadates have excellent physical and chemical properties and are used as the matrix of rare earth luminescent materials. In addition, the charge-transfer band (CTB) in rare earth oxides and the characteristic absorption of VO_43- in rare earth vanadate can further enhance the luminescence properties of rare earth ions. Therefore, the preparation of homogeneous morphology, good dispersion of nanometer-sized rare earth oxides, rare earth vanadate is a hot spot, in addition to the preparation of a single substrate of high efficient polychromatic luminescent phosphors is also a major focus of research. In this thesis, a series of nanometer-scale Lu_2O_3 and LuVO_4, with controllable morphology were prepared by simple and environment-friendly synthesis method. The polychromatic luminescence properties of rare earth ion doped products were studied. The results are as follows: 1. Using tartaric acid as precipitant and water and ethanol as reaction solvent, cauliflower Lu2 (C4H4O6) 3 6H2O precursor was prepared by precipitation method. After calcined at 2 渭 m.700 鈩，
本文编号：2377513
[Abstract]:As a special functional material, rare earth luminescent materials have unique optical, electrical and magnetic properties, so they are widely used in lighting, display, biology, medical and other fields. The study shows that the properties of the materials are affected by their own structure. Due to the advantages of small size, good dispersion and uniform particle size, nanometer-meter materials have attracted extensive attention of researchers. Therefore, the preparation of nanometer-sized rare earth luminescent materials with excellent performance has become a research hotspot in recent years. It is well known that the composition and properties of the matrix will greatly affect the properties of the luminescent materials, so the selection of appropriate matrix materials is the key to the preparation of rare earth luminescent materials with good luminescence properties. Rare earth oxides and vanadates have excellent physical and chemical properties and are used as the matrix of rare earth luminescent materials. In addition, the charge-transfer band (CTB) in rare earth oxides and the characteristic absorption of VO_43- in rare earth vanadate can further enhance the luminescence properties of rare earth ions. Therefore, the preparation of homogeneous morphology, good dispersion of nanometer-sized rare earth oxides, rare earth vanadate is a hot spot, in addition to the preparation of a single substrate of high efficient polychromatic luminescent phosphors is also a major focus of research. In this thesis, a series of nanometer-scale Lu_2O_3 and LuVO_4, with controllable morphology were prepared by simple and environment-friendly synthesis method. The polychromatic luminescence properties of rare earth ion doped products were studied. The results are as follows: 1. Using tartaric acid as precipitant and water and ethanol as reaction solvent, cauliflower Lu2 (C4H4O6) 3 6H2O precursor was prepared by precipitation method. After calcined at 2 渭 m.700 鈩，
本文编号：2377513
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