Enhanced upconversion luminescence in NaGdF4:Yb,Er nanocrystals by Fe3+ doping and their application in bioimaging

被引：220
作者：
Ramasamy, Parthiban
Chandra, Prakash
Rhee, Seog Woo
Kim, Jinkwon [1 ]
机构：
[1] Kongju Natl Univ, Dept Chem, Kong Ju 314701, Chungnam Do, South Korea
来源：
NANOSCALE | 2013年 / 5卷 / 18期
基金：
新加坡国家研究基金会;
关键词：
NANOPARTICLES; ER3+; NANOCOMPOSITES; FLUORESCENCE; TM3+; YB3+;
D O I：
10.1039/c3nr01608k
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The visible green and red upconversion emissions in Er3+/Yb3+ doped beta-NaGdF4 nanoparticles were enhanced by tridoping with Fe3+ ions (0-40 mol%). XRD, XPS, ICP-AES and EDS data demonstrated successful incorporation of Fe3+ ions in NaGdF4:Yb3+/Er3+ nanoparticles. The effect of Fe3+ tridoping on the upconversion luminescence in NaGdF4:Yb3+/Er3+ NPs was investigated in detail. The green and red emission intensities were enhanced by 34 and 30 times, respectively. The maximum emission was observed in a sample containing 30 mol% Fe3+ ions. A possible mechanism for the enhanced upconversion emission is proposed. In addition, a layer of silica was coated onto the surface of UCNPs to improve the biocompatibility. Folic acid was covalently linked to the silica coated UCNPs to form UCNP@SiO2-FA nanoprobes, which have been successfully applied to the fluorescent imaging HeLa cells.
引用
收藏
页码：8711 / 8717
页数：7
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