Preparation and upconversion luminescence of monodisperse Gd2O3:Ho3+,Yb3+ nanocrystals

被引：10
|
作者：
Peng Lingling [1 ]
Liu Bitao [1 ]
Han Tao [1 ]
机构：
[1] Chongqing Univ Arts & Sci, Res Ctr Mat Interdisciplinary Sci, Chongqing Key Lab Micro Nano Mat Engn & Technol, Chongqing 402160, Peoples R China
来源：
JOURNAL OF RARE EARTHS | 2013年 / 31卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Gd2O3:Ho3+; Yb3+; nanocrystals; upconversion luminescence; energy transfer; rare earths; YB3+; GREEN; RED; NANOPARTICLES; EMISSION; ER3+; HO3+;
D O I：
10.1016/S1002-0721(12)60336-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Gd2O3:Ho3+,Yb3+ nanocrystals were synthesized via solvothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), absorption and upconversion spectra were employed to characterize the synthesized nanocrystals. The results of XRD and TEM showed that obtained Gd2O3:Ho3+,Yb3+ nanocrystals were cubic in crystal structure and uniform spherical in morphology. The average crystallite size was calculated to be 7.5 am. Green and red up-conversion emissions corresponding to (F-5(4), S-5(2))-> I-5(8) and F-5(5)-> I-5(8) transition were observed upon 980 nm excitation at room temperature. The results indicated that both green and red luminescence were based on the two-photon processes. Laser power and doping concentration dependence of the up-converted emissions were studied to understand the upconversion mechanisms. Excited state absorption and energy-transfer processes were discussed as the possible mechanisms for the visible emissions.
引用
收藏
页码：650 / 654
页数：5
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