RVNb_2O_9(R=Y,Gd,La):Eu^(3+)(或Dy^(3+))的合成和光谱性质的研究  

SYNTHESIS AND LUMINESCENCE PROPERTIES OF RVNb_2O_9(R=Y,Gd,La):Eu^(3+)(or Dy^(3+))

作　　者：池利生[1] 苏锵[2] 

机构地区：[1]中国科学院福建物质结构研究所,福州350002 [2]中国科学院长春应用化学研究所稀土化学与物理实验室,长春130022

出　　处：《发光快报》1994年第1期15-19,共5页

基　　金：国家自然科学基金资助项目

摘　　要：本文用R_2O_3(R=Y,Gd,La),V_2O_6,Nb_2O_5和高温固相反应法合成了复合钒铌酸盐RVMb_2O_3,并以此为基质研究了Eu^(3+)和Dy^(3+)在其中的光谱性质.实验表明,Eu^(3+)在这三个化合物中均处于偏离反演对称中心的格位上,Eu^(3+)的荧光强度的红/横比(R/O)和Dy^(3+)的黄/蓝比(Y/B)均随R^(3+)的电荷半径比的减小而下降.同时还研究了Bi^(3+)和温度对Dy^(3+)的发射强度的影响.From the results of X-ray diffraction,it is certain that RVNb2O9(R=Y,Gd,La) can be obtained by solid state reaction with R2O3,V2O5 and Nb2O5.The luminescence properties of Eu3+ and Dy3+ in RVNb2Os (R = Y,Gd, La) have been systematically investigated. It is shown that host can sensitize Eu3+ and Dy3+ in these compounds. Eu3+ occupies site with deviation from inverse center in RVNb2O9 (R= Y,Gd,La), because the intensity of 5D9-7F2 transition of Eu3+ is stronger than that of 5D0-7F1 transition and the transition of 5D9-7F0 does not appear in these three matrixes(Fig. 1),The red-to-orange intensity ratio (R/O) of Eu3+ and the yellow-to-blue intensity ratio (Y/B) of Dy3+ decrease with decreasing of the charge-to-radius ratio (Z/r) of R3+ (Table 1).The influence of Bi3+ and temperature on the emission intensity of Dy3+ were also investigated, Bi3+ acts as a 'killer' for the emission of Dy3+.

关 键 词：铕 镝 铋 发光 光谱 

分 类 号：O482.31[理学—固体物理]