MgWO_4:Nd^(3+)的水热合成及近红外发光性能研究  

Hydrothermal Preparation and Luminescent Properties of MgWO_4:Nd^(3+)

作　　者：李锦清[1] 杨创涛[1] 孟建新[2] 

机构地区：[1]暨南大学化学系 [2]暨南大学纳米化学研究所,广东广州510632

出　　处：《中国稀土学报》2009年第6期730-734,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(30670523);广东省自然科学基金团队项目(05200555)资助

摘　　要：采用水热法制备MgWO4:Nd3+近红外发光材料。通过XRD,SEM和发光光谱等手段对样品的物相、形貌、发光性质进行表征。XRD测试结果表明:水热法制备MgWO4:Nd3+在850℃以上煅烧时,四方晶系转变为单斜晶系;1050℃煅烧后,SEM显示样品形貌由片状变为棒状且分散良好;激发和发射光谱的对比研究表明,MgWO4:Nd3+中WO42-对Nd3+存在有效的能量传递。研究了Nd3+的掺杂量、煅烧温度、煅烧时间对材料近红外发光的影响。结果表明:在1050℃煅烧时,Nd3+掺杂量为0.5%时发光最强;随着煅烧温度的升高,MgWO4:Nd3+的近红外发光强度先增强后减弱,而煅烧时间对发光强度影响很小。Nd3＋doped MgWO4 powder was prepared by hydrothermal method and characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and photoluminescence spectroscopy（PL）.The XRD measurements indicated that the hydrothermally prepared samples were tetragonal phase and they transferred to monoclinic phase after sintered at the temperature higher than 850 ℃.The SEM imagines showed that the hydrothermal samples were a flake shape and changed to well dispersed rod-like particles when sintered at 1050 ℃.The energy transfer from WO2-4 group to Nd3＋ ions was found.The effects of sintering temperature,sintering time and Nd3＋ concentration on the near-infrared luminescence were investigated.An optimized Nd3＋-doped concentration of 0.5%（mole fraction） and sintering temperature of 1050 ℃ were found.But sintering time had little effect on the near-infrared fluorescence intensity.

关 键 词：MgWO4 水热合成 近红外发光 稀土 

分 类 号：O482.3[理学—固体物理]