层状下转换材料KLa_(0.90)Nb_2O_7:Eu^(3+)的制备和发光性质研究  

Preparation and PL properties of the layered down-conversion material:KLa_(0.90)Nb_2O_7:Eu^(3+)

作　　者：吴磊[1] 张海明[1] 张晶晶[1] 郭聪[1] 姬子晔 白小刚[1] 

机构地区：[1]天津工业大学理学院,天津300387

出　　处：《光电子．激光》2015年第12期2340-2345,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61274064)资助项目

摘　　要：利用高温固相反应法,制备了具有层状钙钛矿结构的下转换材料KLa_(0.90)Nb_2O_7:Eu^(3+)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见吸收(UV-Vis)和荧光分光光度计分别对产物的晶体结构、微观形貌和光致发光(PL)性质进行了检测。XRD结果表明,产物KLa_(0.90)Nb_2O_7:Eu^(3+)属正交晶系的钙钛矿结构晶体,产物中有EuNbO4的杂相存在。煅烧温度和时间分别为1 150℃、12h是合成KLa_(0.90)Nb_2O_7:Eu^(3+)的适宜条件。PL谱显示,在363nm波长激发下,KLa_(0.90)Nb_2O_7:Eu^(3+)有波长为578nm,592和614nm 3个发光峰。KLa_(0.90)Nb_2O_7:Eu^(3+)因层状结构在制备薄膜器件时具有优势,有望在光伏器件尤其是Si基太阳能电池中增加光电转换效率并且延长器件使用寿命。In order to verify the feasibility about down-conversion materials applied in photovoltaic devices and examine the optical properties of KLa0. 90 Nb2 07 ：Eu3＋ which closely related to the preparation conditions, an experimental research is completed in this framework. The formation of lameUar perovskite compound KLa0.90 Nb2O7 ：Eu3＋ which serves as a novel down-converter was accomplished by a conventional solid-state reaction method. Diverse preparation conditions, doping concentration of rare-earth ion, calcination temperature and calcination duration, are brought into the experimental respectively. The structure, morphology and optical properties of the product have been characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, ultraviolet-visible spectra （UV-Vis） and fluorescence spectrophotometer, respectively. The XRD patterns indicate that KLa0.90 Nb2 07 ： Eu3＋ belongs to ortho- rhombic perovskite system, and a little impurity phase of EuNbO4 is detected. The appropriate calcination temperature is 1 150 ℃ ,and duration is 12 h and the preferable doping concentration of Eu3＋ is 5% when it comes to the photoluminescenee intensity which is taken into consideration within photovoltaic devices. The photoluminescence spectra depict that the emission peaks of KLao. 9o Nb2 07 ..Eu3＋ are 578 nm,592 nm and 614 nm, respectively, under the excitation wavelength 363 nm.Additionally, KLa0.90 Nb2O7 ：Eu3＋ can be availably applied in photovoltaic devices to increase the power conversion efficiency and enhance the durability of PV modules, particularly in Si-based solar cells, since its layered structure being available in thin film deposition.

关 键 词：层状钙钛矿 下转换材料 光致发光(PL) 太阳能电池 

分 类 号：O482.31[理学—固体物理]