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NaGdF4∶Yb3+,Ho3+与GdF3∶Yb3+,Ho3+纳米材料的合成、形貌控制与发光性质

NaGdF4∶Yb3+,Ho3+ and GdF3∶Yb3+,Ho3+ Nanocrystals:Controlled Synthesis and Morphology Dependent Upconversion Luminescence

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摘要

采用水热法通过调控n(F-)∶n(Ln3+),pH值以及n(Citrate)∶n(Ln)等一系列反应条件,合成了六方相的NaGdF4∶Yb3+,Ho3+与GdF3∶Yb3+,Ho3+纳米上转换材料,实现了形貌的可控合成。利用X射线粉末衍射(XRD),场扫描电子显微镜(SEM)以及发光光谱等手段对产物的物相结构、形貌和荧光性质进行了研究。在980 nm光激发下,六方相的NaGdF4∶Yb3+,Ho3+与GdF3∶Yb3+,Ho3+样品均显示出绿光(541 nm)和红光(647 nm)发射,分别来自于Ho3+的5F4,5S2→5I8和5F5→5I8的跃迁。结果显示NaGdF4∶Yb3+,Ho3+六棱柱与六棱片结构的发光远强于GdF3∶Yb3+,Ho3+的发光,但在pH=7.0,9.0时生成的NaGdF4∶Yb3+,Ho3+球形结构发光效率低于GdF3∶Yb3+,Ho3+。这表明六方相NaGdF4∶Yb3+,Ho3+不同形貌样品的尺寸与结晶性对发光效率影响很大。

Abstract

The up-conversion NaGdF4∶Yb3+,Ho3+ and GdF3∶Yb3+,Ho3+ nanocrystals were successfully prepared by hydrothermal method. The samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and luminescence spectra. The crystal structure and morphology can be well controlled by adjusting the molar ratio of n(F-)∶n(Ln3+),the value of pH and the molar ratio of n(Citrate)∶n(Ln). The hexagonal NaGdF4∶Yb3+,Ho3+ and GdF3∶Yb3+,Ho3+ samples exhibit green(541 nm)and red(647 nm)emissions under 980 nm excitation, which are assigned to the transition of 5F4,5S2→5I8 and 5F5→5I8 in Ho3+,respectively. It was found that the upconversion efficiency of the hexagonal prism and flake NaGdF4∶Yb3+,Ho3+ samples are much stronger than that of GdF3∶Yb3+,Ho3+ samples, but the spherical NaGdF4∶Yb3+,Ho3+ samples are weaker than GdF3∶Yb3+,Ho3+ samples. This indicates that the upconversion efficiency of hexagonal NaGdF4∶Yb3+,Ho3+ samples are greatly impacted by the different size and crystalline for different morphology.

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中图分类号:O482.31

DOI:10.3788/fgxb20113212.1233

所属栏目:材料合成及性能研究

基金项目:国家自然科学基金(10834006,10774141,10904141,10904140); 国家科技部(2006CB601104); 吉林省科技发展计划(20090134,20090524); 中国科学院创新项目资助

收稿日期:2011-07-27

修改稿日期:2011-08-23

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作者单位    点击查看

曹健:中国科学院 激发态重点实验室 长春光学精密机械与物理研究所,吉林 长春130033中国科学院 研究生院, 北京100039
张霞:中国科学院 激发态重点实验室 长春光学精密机械与物理研究所,吉林 长春130033
郝振东:中国科学院 激发态重点实验室 长春光学精密机械与物理研究所,吉林 长春130033
张家骅:中国科学院 激发态重点实验室 长春光学精密机械与物理研究所,吉林 长春130033

联系人作者:曹健(jlueducj@126.com)

备注:曹健(1987-), 男, 辽宁海城人, 主要从事稀土发光材料的研究。

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引用该论文

CAO Jian,ZHANG Xia,HAO Zhen-dong,ZHANG Jia-hua. NaGdF4∶Yb3+,Ho3+ and GdF3∶Yb3+,Ho3+ Nanocrystals:Controlled Synthesis and Morphology Dependent Upconversion Luminescence[J]. Chinese Journal of Luminescence, 2011, 32(12): 1233-1237

曹健,张霞,郝振东,张家骅. NaGdF4∶Yb3+,Ho3+与GdF3∶Yb3+,Ho3+纳米材料的合成、形貌控制与发光性质[J]. 发光学报, 2011, 32(12): 1233-1237

被引情况

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【2】韩松,宋博,刘磊,贺超,杨魁胜. CdWO4∶Yb3+ ,Ho3+纳米晶的制备及发光性能研究. 发光学报, 2013, 34(9): 1183-1187

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