Open AccessIntense Red Upconversion Emission and Shape Controlled Synthesis of Gd2O3:Yb/Er Nanocrystals
Author(s) -
Zhigao Yi,
Boyun Wen,
Chao Qian,
Haibo Wang,
Ling Rao,
Hongrong Liu,
Songjun Zeng
Publication year - 2013
Publication title -
advances in condensed matter physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.314
H-Index - 26
eISSN - 1687-8124
pISSN - 1687-8108
DOI - 10.1155/2013/509374
Subject(s) - photon upconversion , materials science , nanocrystal , transmission electron microscopy , luminescence , analytical chemistry (journal) , spectroscopy , hydrothermal circulation , nanotechnology , optoelectronics , chemical engineering , chemistry , physics , chromatography , quantum mechanics , engineering
Yb/Er codoped Gd(OH)3 was synthesized firstly via a simple hydrothermal treatment of the corresponding nitrate in the presence of alkali by tuning the pH values. The Gd2O3:Yb/Er nanocrystals were obtained via sintering the corresponding hydroxides precursors. The as-prepared samples were characterized by the typical X-ray diffraction, energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, and spectrophotometer. The results revealed that two shapes of the as-prepared Gd2O3:Yb/Er nanocrystals can be readily tuned from lemon-like particle to rod-like structure via tuning pH values from 7 to 14. Moreover, compared with the samples prepared at pH 7, the Gd2O3:Yb/Er nanocrystals prepared at pH 14 exhibit enhanced red upconversion emission and higher upconversion luminescence intensity under the excitation of 980 nm laser
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