通过改变基质阳离子半径使O^(2-)→Eu^(3+)电荷迁移带红移  

Red shift of O^(2-)→Eu^(3 +)Charge Transfer Band by Changing The Host Cationic Radiu

作　　者：王洪杰[1] 吕玲玲 张粟[2] 冯婧[2] 庞然[2] 姜丽宏[2] 李达[2] 李成宇[2] 

机构地区：[1]吉林建筑大学材料科学与工程学院,吉林长春130118 [2]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,吉林长春130022

出　　处：《发光学报》2017年第11期1429-1435,共7页Chinese Journal of Luminescence

基　　金：国家重点研发计划(2016YFB0701003)资助项目~~

摘　　要：采用高温固相法在1 300℃合成了A_(0.98)Nb_2O_6∶Eu_(0.02)(A=Ca,Sr,Ba)荧光粉。X射线衍射(XRD)的结果表明烧结后得到的产物为纯相。利用稳态荧光光谱(PL)和漫反射光谱(DRS)对A_(0.98)Nb_2O_6∶Eu_(0.02)(A=Ca,Sr,Ba)的发光性质进行了研究。结果表明A_(0.98)Nb_2O_6∶Eu_(0.02)(A=Ca,Sr,Ba)荧光粉可以发射Eu^(3+)的特征红光,光强度按Ca Nb_2O_6>Sr Nb_2O_6>Ba Nb_2O_6从大到小排列。激发光谱中可以观察到Eu^(3+)离子的电荷转移跃迁(CT)和f-f跃迁吸收。其中CT吸收峰因基质阳离子半径的增大而发生了较大程度的红移,从270 nm红移到了330 nm。The phosphors with general molecular formula A0.98Nb2O6∶Eu0.02（A=Ca,Sr,Ba） were prepared by the high-temperature solid state reaction technique. X-ray diffraction（ XRD） results reveal that the obtained products are pure phase. The luminescence properties of A0.98Nb2O6∶Eu0.02（A=Ca,Sr,Ba） were investigated by photoluminescence spectra（ PL） and diffuse reflection spectra（ DRS）. A0.98Nb2O6∶Eu0.02（A=Ca,Sr,Ba） phosphors can exhibit the characteristic red emission of Eu^3＋,and PL intensities of A0. 98 Nb2O6∶ Eu0. 02 are in the order of Ca Nb2O6 〉SrNb2O6〉Ba Nb2 O6. The charge transfer transition（ CT） and f-f transition absorption of Eu^3＋can be observed in the excitation spectra. With the increase of the host cationic radius,the CT band shows large red shift from 270 to 330 nm.

关 键 词：ANb2O6 荧光粉 电荷迁移带 EU^3+ 

分 类 号：O482.31[理学—固体物理]