期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 767, 期 -, 页码 775-781出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.166
关键词
Magnetic-optical bifunctional properties; beta-NaYF4:Yb3+,Er3+@NaGdF4; Upconversion; Core-shell
资金
- Natural Science Foundation of Shanghai [18ZR1441900]
- National Natural Science Foundation of China [51772210]
In this work, the monodisperse spherical pure beta-NaYF4:Yb3+,Er3+ core NCs with average size of 7.2 nm were synthesized by using NaOA as sodium source instead of the conventional NaOH, based on which the sub-20 nm beta-NaYF4:Yb3+,Er3+@NaGdF4 core-shell NCs with magnetic-optical bifunctional properties were successfully obtained with seed-mediated growth method. The magnetization of the core-shell NCs enhanced proportionally with increased shell thickness, and the maximum upconversion intensity was three orders of magnitude increased in the 18.3 nm NaYF4:Yb3+,Er3+@NaGdF4 core-shell NCs compare with the corresponding core NCs. Besides, the upconversion mechanism for the core and core-shell NCs were discussed. This work may lead to an ideal platform for the preparation of sub-20 nm spherical NCs with magnetic and optical properties for application in biomedical imaging and drug delivery. (C) 2018 Elsevier B.V. All rights reserved.
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