Quantum cutting downconversion by cooperative energy transfer from Bi^(3+) to Yb^(3+) in Y_2O_3 phosphor  

作　　者：韦先涛 赵江波 陈永虎 尹民 李勇 

机构地区：[1]Department of Physics,University of Science and Technology of China

出　　处：《Chinese Physics B》2010年第7期576-580,共5页中国物理B（英文版）

基　　金：supported by the National Nature Science Foundation of China (Grant No. 10774140);the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-YW-M11);the Specialized Research Fund for the Doctoral Program of Higher Education,China (Grant No. 20060358054);the Special Foundation for Talents of Anhui Province,China (GrantNo. 2007Z021)

摘　　要：Bi3＋ and Yb3＋ codoped cubic Y2O3 phosphors are prepared by pechini sol-gel method. Strong near-infrared （NIR） emission around 980 nm from Yb3＋ （2F5/2＋2 F7/2） is observed under ultraviolet light excitation. A broad excitation band ranging from 320 to 360 nm, owing to the 6s2→6s6p transition of Bi3＋ ions, is recorded when the Yb3＋ emission is monitored, which suggests a very efficient energy transfer from Bi3＋ ions to Yb3＋ ions. The Yb3＋ concentration dependences of both the Bi3＋ and the Yb3＋ emissions are investigated. The decay curve of Bi3＋ emission under the excitation of 355 nm pulse laser is used to explore the Bi3＋ →＋Yb3＋ energy transfer process. Cooperative energy transfer （CET） is discussed as a possible mechanism for the near-infrared emission.Bi3＋ and Yb3＋ codoped cubic Y2O3 phosphors are prepared by pechini sol-gel method. Strong near-infrared （NIR） emission around 980 nm from Yb3＋ （2F5/2＋2 F7/2） is observed under ultraviolet light excitation. A broad excitation band ranging from 320 to 360 nm, owing to the 6s2→6s6p transition of Bi3＋ ions, is recorded when the Yb3＋ emission is monitored, which suggests a very efficient energy transfer from Bi3＋ ions to Yb3＋ ions. The Yb3＋ concentration dependences of both the Bi3＋ and the Yb3＋ emissions are investigated. The decay curve of Bi3＋ emission under the excitation of 355 nm pulse laser is used to explore the Bi3＋ →＋Yb3＋ energy transfer process. Cooperative energy transfer （CET） is discussed as a possible mechanism for the near-infrared emission.

关 键 词：DOWNCONVERSION cooperative energy transfer PHOTOLUMINESCENCE 

分 类 号：O482.31[理学—固体物理]