Synthesis, characterization, and biological application of size-controlled nanocrystalline NaYF4:Yb,Er infrared-to-visible up-conversion phosphors

被引:943
作者
Yi, GS [1 ]
Lu, HC
Zhao, SY
Yue, G
Yang, WJ
Chen, DP
Guo, LH
机构
[1] Shandong Univ Technol, Fac Mat Sci & Engn, Zibo 255049, Peoples R China
[2] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
[3] Beijing Natl Biochip Res & Engn Ctr, Beijing 102206, Changping Dist, Peoples R China
[4] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Haidian Dist, Peoples R China
关键词
D O I
10.1021/nl048680h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nanocrystalline infrared-to-visible up-conversion phosphors, ytterbium and erbium co-doped sodium yttrium fluoride, were synthesized. Spherical particles with narrow size distribution were prepared by a co-precipitation method in the presence of ethylenediaminetetraacetic acid (EDTA). Particles of controlled size in the range of 37 to 166 nm diameter were obtained by adjusting the molar ratio of EDTA to total lanthanides. Although the as-prepared nanoparticles emit very weak up-conversion fluorescence when excited by infrared light, the emission was enhanced by up to 40-fold after they were annealed at temperatures between 400 and 600 degreesC. By comparison with the bulk phosphor, the luminescence efficiency of the nanoparticle was estimated to be 1%. Factors affecting the particle size and their up-conversion fluorescence intensity were investigated by various microscopic and spectroscopic techniques. Preliminary results demonstrated the nanoparticles as promising up-converting fluorescence labels in the detection of biological interactions.
引用
收藏
页码:2191 / 2196
页数:6
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