期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 5, 页码 2348-2354出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.11.016
关键词
Optical materials; Chemical synthesis; Luminescence
资金
- National Natural Science Foundation of China [20976002, 20876002]
- Beijing Natural Science Foundation [2091002, 2082009]
- Academic Human Resources Development in the Institution of Higher Learning Under the Jurisdiction of Beijing Municipality
Well-crystallized and regular-shaped BaYF5:Yb3+/Er3+. upconversion (UC) fluorescent nanocrystals (NCs) were synthesized in a modified water-ethanol-oleic acid system. The size and shape of the NCs were controlled by adjusting the amount of NaOH, reaction temperature and time. Well oil-dispersible NCs exhibited bright UC fluorescence under the 980 nm excitation. Furthermore, a systematic study on the photoluminescence of Yb3+/Er3+-doped BaYF5 samples with different size and shapes indicated that the optical properties of products were strongly dependent on their size, and the configuration of nanocrystals were found to sensibly affect the optical properties of the products. Great enhancement of the green emission intensity was observed with increasing crystalline size. It was found that the crystalline and surface effects could be responsible for the observation and this behavior was attributed to a change of conditions and the quenching effect of the organic ligands. (C) 2010 Elsevier B.V. All rights reserved.
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