Hydrothermal synthesis and up-conversion luminescence of Ho^(3+)/Yb^(3+)co-doped CaF_2  

作　　者：杨征 郭崇峰 陈叶青 李琳 李婷 郑仲铉 

机构地区：[1]National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base) in Shaanxi Province,Institute of Photonics & Photon-Technology, Northwest University [2]Department of Physics, Pukyong National University

出　　处：《Chinese Physics B》2014年第6期271-277,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11274251);the Natural Science Foundation of Hubei Province,China(Grant No.2010CDB01607);the Technology Foundation for Selected Overseas Chinese Scholar,Ministry of Personnel of China(excellent);the Foundation of Shaanxi Educational Committee,China(Grant No.11JK0528);the Foundation of Key Laboratory of Photoelectric Technology in Shaanxi Province,China(Grant No.12JS094)

摘　　要：CaF2：Ho3＋/Yb3＋ nano-particles with intense green up-conversion （UC） luminescence are successfully synthesized via a facile hydrothermal approach by using NH4F as the fluoride source and Na2EDTA as a chelating reagent. Powder X- ray diffraction （XRD）, transmission electron microscopy （TEM）, field emission scanning electron microscopy （FE-SEM）, and UC emission spectra are used to characterize the structures, shapes, and luminescent properties of the samples. The effects from fluoride sources and chelating reagents on the formations of CaF2 nano-particles are investigated, and the for- mation process is also deduced. Under the excitation of a 980-nm laser diode, the samples each show a green up-conversion emission centered at 540 nm corresponding to the 5S2/5F4-＋518 transitions of Ho3＋. Moreover, the UC mechanisms of Ho3＋/Yb3＋ co-doped CaF2 nano-particles are also discussed.CaF2：Ho3＋/Yb3＋ nano-particles with intense green up-conversion （UC） luminescence are successfully synthesized via a facile hydrothermal approach by using NH4F as the fluoride source and Na2EDTA as a chelating reagent. Powder X- ray diffraction （XRD）, transmission electron microscopy （TEM）, field emission scanning electron microscopy （FE-SEM）, and UC emission spectra are used to characterize the structures, shapes, and luminescent properties of the samples. The effects from fluoride sources and chelating reagents on the formations of CaF2 nano-particles are investigated, and the for- mation process is also deduced. Under the excitation of a 980-nm laser diode, the samples each show a green up-conversion emission centered at 540 nm corresponding to the 5S2/5F4-＋518 transitions of Ho3＋. Moreover, the UC mechanisms of Ho3＋/Yb3＋ co-doped CaF2 nano-particles are also discussed.

关 键 词：CAF2 NANO-PARTICLES UP-CONVERSION hydrothermal synthesis 

分 类 号：O482.31[理学—固体物理]