GdVO_4:Eu^(3+)纳米晶的熔盐法合成与发光性能（英文）  

Molten Salt Synthesis and Luminescent Properties of GdVO_4:Eu^(3+) Nanophosphors

作　　者：周志强[1] 郭丽[1] 贾佩云[1] 

机构地区：[1]东北林业大学,黑龙江哈尔滨150040

出　　处：《稀有金属材料与工程》2014年第7期1588-1593,共6页Rare Metal Materials and Engineering

基　　金：Fundamental Research Funds for the Central Universities(DL12BB21,DL13BB01)

摘　　要：以等摩尔的硝酸钠和硝酸钾作为反应介质,氢氧化钠作为碱化剂,采用熔盐法制备了GdVO4:Eu3+纳米晶。利用X射线衍射(XRD)仪、傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)、荧光光谱(PL)和荧光寿命(Lifetime)等手段对产物的相态、结晶度、结构、形貌和发光性能等进行了表征与研究。X射线衍射结果表明,产物在250°C时开始结晶,400°C时结晶完全,控制反应体系碱度和温度可获得纯四方相GdVO4:Eu3+晶体。透射电镜观察结果显示,产物为粒径20 nm左右的立方形颗粒,分散良好,形貌均一。依据XRD数据计算结果表明,GdVO4:Eu3+纳米晶的晶胞参数和晶胞体积相对于体相材料均有所减小,归因于纳米晶表面大量悬键的存在,并通过FT-IR得到验证。315 nm波长光的激发下,GdVO4:Eu3+纳米晶呈现Eu3+的特征发射光谱,表明了能量由VO43-向Eu3+的传递。发射强度和荧光寿命研究表明,Eu3+的最佳掺杂浓度为5%(摩尔分数)。GdVO4：Eu3＋ nanophosphors were prepared via molten salt synthesis. Equal moles of NaNO3 and KNO3 were used as reaction medium, rare earth nitrates and NH4VO3 as precursors, and NaOH as alkalizer. X-ray diffraction （XRD）, Fourier transform infrared （FT-IR）, transmission electron microscopy （TEM）, photoluminescence （PL） spectrum and lifetime were used to characterize the nanophosphors. XRD demonstrates that NaOH concentration and the sintering temperature play important roles in the crystallin- ity and the phase purity of the products. The optimum NaOH concentration and sintering temperature are 2：40 and 400℃, respectively. TEM micrographs show that the GdVO4：Eu3＋ nanocrystals exhibit a cubic morphology and have a mean size of about 20 nm, which is in good agreement with that calculated by Scherrer＇s formula. Both the cell parameters and the volume of GdVO4：Eu3＋ nanocrystals decrease due to the existence of big quantity of dangling bonds on the particle surface. Upon excitation at 315 nm, the GdVO4：Eu3＋ nanocrystals show the strong characteristic emission of Eu3＋, which indicates the efficient energy transfer from VO43 groups to Eu3＋. The best doping concentration of Eu3＋ in GdVO4 is determined to be 5 mol%.

关 键 词：熔盐合成 纳米晶 发光 GdVO4 

分 类 号：TB383.1[一般工业技术—材料科学与工程]