Pb^(2+)掺杂导致的CaF_2中Yb^(3+)离子三聚体合作发光猝灭  

Pb^(2+) Ions Doping Induced Cooperative Luminescence Quenching of Yb^(3+)-trimers in CaF_2

作　　者：吐尔逊.艾迪力比克 杨育 赵丹[1] 秦伟平[1] 

机构地区：[1]吉林大学电子科学与工程学院,吉林长春130012 [2]伊犁师范学院电子与信息工程学院,新疆伊宁835000

出　　处：《发光学报》2017年第10期1280-1286,共7页Chinese Journal of Luminescence

基　　金：国家自然科学基金(11274139;11474132);新疆科技厅自然科学基金(2015211C295);伊犁师范学院微纳电传感技术与仿生器械实验室开放项目(2016wnzd004)资助~~

摘　　要：利用978 nm近红外光激发样品Ca F2∶Pb2+,Yb3+,在室温下观察到二价Pb2+离子在383 nm附近的紫外上转换发光。该发射峰对应于Pb2+离子的3P0"1A1g(1S0)跃迁。瞬态光谱测量结果表明:在这个材料体系中,Pb2+离子的激发来自于Yb3+离子三聚体的合作敏化。但是随着Pb2+离子掺杂浓度的提高,Yb3+离子三聚体遭到结构性破坏,导致其合作发光减弱。本文首次利用Pb2+离子掺杂造成Yb3+离子三聚体的结构性破坏,从而引起合作荧光猝灭,并对在Ca F2基质中因其他二价离子的掺入而造成的Yb3+三聚体合作发光猝灭给予了合理的解释。At room temperature,the ultraviolet（ UV） upconversion emissions from Ca F2∶ Pb^2＋,Yb^3＋were observed under the excitation of 978 nm near infrared（ NIR） laser. The upconversion emission peak is centered at 383 nm,which is ascribed to the3P0＂1A1g（1S0） transition of Pb^2＋ions. Through the results of transient measurements,the upconversion process of Pb^2＋ions is confirmed. The energy transfer process is that three excited Yb^3＋ions simultaneously transfer their energy to one Pb^2＋ion. With the increasing of Pb^2＋concentration,the cooperative luminescence from Yb^3＋clusters decreases gradually. In order to explain this phenomenon,we propose a new cooperative luminescence quenching mechanism in this paper,which is originated from Pb^2＋induced structure destruction of Yb^3＋-trimers. The fluorescence quenching in Pb^2＋and Yb^3＋codoped Ca F2 is given a reasonable explanation.

关 键 词：Yb^3+离子三聚体 合作敏化 Pb^2+离子 紫外上转换发光 

分 类 号：O482.31[理学—固体物理]