Fluorescence properties of divalent and trivalent europium ions in CdWO_4 single crystals grown by the Bridgman method  

作　　者：胡皓阳 夏海平 胡建旭 张约品 江浩川 陈红兵 

机构地区：[1]Key Laboratory of Photo-electronic Materials,Ningbo University [2]Ningbo Institute of Materials Technology and Engineering,the Chinese Academy of Sciences [3]Faculty of Material Science and Chemical Engineering,Ningbo University

出　　处：《Chinese Physics B》2013年第2期506-510,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 50972061,51272109,and 21171102);the Natural Science Foundation of Zhejiang Province of China (Grant Nos. R4100364 and Z4110072);the Natural Science Foundation of Ningbo City (Grant No. 2012A610115);K. C.Wong Magna Fund in Ningbo University

摘　　要：Optical absorption,excitation,and fluorescence were investigated in Eu ion-doped CdWO4 single crystal grown by a modified Bridgman method.The results indicate that Eu^2＋ and Eu^3＋ ions coexist in CdWO4 crystal and an energy transfer occurs between these Eu^2＋ and Eu^3＋ ions.When the crystal is excited by 266-nm light,the energy corresponding to the 4f65d to 8S7/2 transition of Eu^2＋ ions results in the excitation of the Eu^3＋ ions to the 5DJ level.The effect on fluorescence of annealing in oxygen at various temperatures was investigated.The excitation intensity of Eu^2＋ ions at 266 nm decreases as annealing temperature increases from 300 K to 1073 K,but it remains at a certain equilibrium level when the annealing temperature is further increased.Optical absorption,excitation,and fluorescence were investigated in Eu ion-doped CdWO4 single crystal grown by a modified Bridgman method.The results indicate that Eu^2＋ and Eu^3＋ ions coexist in CdWO4 crystal and an energy transfer occurs between these Eu^2＋ and Eu^3＋ ions.When the crystal is excited by 266-nm light,the energy corresponding to the 4f65d to 8S7/2 transition of Eu^2＋ ions results in the excitation of the Eu^3＋ ions to the 5DJ level.The effect on fluorescence of annealing in oxygen at various temperatures was investigated.The excitation intensity of Eu^2＋ ions at 266 nm decreases as annealing temperature increases from 300 K to 1073 K,but it remains at a certain equilibrium level when the annealing temperature is further increased.

关 键 词：Eu^2＋ ion optical spectra cadmium tungstate Bridgman method 

分 类 号：O782[理学—晶体学]