【摘要】：稀土發(fā)光材料作為一種特殊的功能材料具有獨特的光、電、磁性能,因而被廣泛的應用于照明、顯示、生物、醫(yī)療等領域。研究表明,材料的性質(zhì)受到其本身結構的影響,由于納微米材料具有尺寸小、分散性好、粒度均一等優(yōu)點引起了研究者們的廣泛關注。因此制備性能優(yōu)異的納微米級稀土發(fā)光材料成為了近年來的研究熱點。眾所周知,基質(zhì)的組成和性質(zhì)會在很大程度上影響發(fā)光材料的性能,所以選擇合適的基質(zhì)材料是制備發(fā)光性質(zhì)良好的稀土發(fā)光材料的關鍵。稀土氧化物和釩酸鹽具有優(yōu)異的物理、化學性質(zhì),被用作稀土發(fā)光材料的基質(zhì)。此外,稀土氧化物中的電荷遷移帶(CTB)及稀土釩酸鹽中VO_43-的特征吸收,可以進一步增強稀土離子的發(fā)光性質(zhì)。因此制備出形貌均一、分散性良好的納微米級稀土氧化物、稀土釩酸鹽是研究的熱點,此外制備出高效的單一基質(zhì)的多色發(fā)光熒光粉也是研究的一大重點。本論文主要采用簡單、環(huán)境友好的合成方法制備出一系列形貌可控的納微米級Lu_2O_3及LuVO_4,并研究了稀土離子摻雜產(chǎn)物的多色發(fā)光性能,取得以下研究成果:1、以酒石酸為沉淀劑、水和乙醇作為反應溶劑,利用沉淀法制備出菜花狀Lu2(C4H4O6)3·6H2O前驅體,粒徑約為2μm。700℃煅燒后即可得到粒徑約為1μm的菜花狀Lu_2O_3。研究了菜花狀結構的形成過程。改變?nèi)軇┲兴鸵掖嫉谋壤纯芍苽涑霾煌蚊驳那膀岓w(片狀、碟狀),討論了不同形貌產(chǎn)物的形成原因。對納米片及菜花狀Lu2(C4H4O6)3·6H2O:Eu~(3+)和Lu_2O_3:Eu~(3+)進行發(fā)光性質(zhì)對比,光譜中均出現(xiàn)了Eu~(3+)的特征發(fā)射,此外菜花狀結構具有更好的發(fā)光效果。進一步研究了菜花狀Lu2(C4H4O6)3·6H2O:Tb~(3+)和Lu_2O_3:Tb~(3+)的發(fā)光性質(zhì),在紫外光的激發(fā)下,產(chǎn)物出現(xiàn)較強的綠光發(fā)射,歸屬為Tb~(3+)離子5D4-7FJ的特征躍遷。2、以酒石酸為形貌控制劑,利用溶劑熱法制備出3D球形結構的LuVO_4,產(chǎn)物直徑為2μm,由納米片自組裝而成。詳細研究了酒石酸的量、溶液pH值、反應溫度、反應時間對產(chǎn)物形貌的影響,闡明了不同形貌產(chǎn)物(納米粒子、納米片、亞微米片、納米四邊形、球形、塊狀結構)的形成機理。以球形結構LuVO_4為基質(zhì),研究了Dy-Eu共摻LuVO_4樣品中Dy~(3+)與Eu~(3+)之間的能量傳遞機理,通過能量傳遞可以實現(xiàn)樣品從黃綠光、橙光到紅光的多色光發(fā)射。在275 nm(VO_43-特征激發(fā)峰)監(jiān)測下,研究3D球形LuVO_4:Tm-Dy、LuVO_4:Dy-Eu、LuVO_4:Tm-Dy-Eu共摻及三摻樣品的發(fā)光性質(zhì),樣品的發(fā)射光譜中均出現(xiàn)摻雜離子的特征發(fā)射,實現(xiàn)了從藍光、藍綠光、黃綠光、橙光到紅光,以及白光的多色光發(fā)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，

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