光谱学与光谱分析 |
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Color-Tunable Nano-Material α-NaYF4:Yb, Er, Tm Prepared by Microemulsion-Hydrothermal Method |
LONG Dan-dan1, ZHANG Qing-xia1, WANG Yu3, ZHANG Fan2, WANG Yan-fei2, ZHOU Xin2, QI Xiao-hua2, ZHANG Heng1, YAN Jing-hui1*, ZOU Ming-qiang2* |
1. School of Chemical and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China 2. Chinese Academy of Inspection and Quarantine, Beijing 100123, China 3. China National Accreditation Service of Conformity Assessment, Beijing 100062, China |
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Abstract NaYF4:Yb3+, Er3+, Tm3+ nanoparticles were prepared by microemulsion-hydrothermal method. Crystal phase, morphology and structure of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The luminescence properties were studied by up-conversional fluorescence spectroscopy. The XRD patterns of as-prepared samples were in agreement with the PDF #77-2042 of cubic NaYF4. SEM images of the particles showed that the samples were cotton-like spherical in shape and which were assembled by smaller nano-particles. The average size was 120 nm, while the shape was regular and the particle size was homogeneous. Under the excitation of 980 nm, the as-prepared particles could emit blue (438 and 486 nm), green (523 and 539 nm) and red (650 nm) light simultaneously. It can be seen from the color coordinates figure (CIE) that when doping concentration ratio of Tm3+ and Er3+ increased from 0 to 2, the whole emitting light color of samples movedto green region. While the ratio was 1:1, pseudo white light was obtained. As the ratio changed from 2 to 7, the luminous color was moved to red region.
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Received: 2013-01-08
Accepted: 2013-04-08
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Corresponding Authors:
YAN Jing-hui, ZOU Ming-qiang
E-mail: yanjinghui8888@yahoo.com.cn;mingqiangz@sina.com
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