Lanthanide-doped LaOBr nanocrystals: controlled synthesis, optical spectroscopy and bioimaging

被引:19
作者
Wang, Huiqi [1 ,2 ,3 ]
Tu, Datao [1 ,2 ]
Xu, Jin [1 ,2 ]
Shang, Xiaoying [1 ,2 ]
Hu, Ping [1 ,2 ]
Li, Renfu [1 ,2 ]
Zheng, Wei [1 ,2 ]
Chen, Zhuo [1 ,2 ,3 ]
Chen, Xueyuan [1 ,2 ,3 ]
机构
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, CAS Key Lab Design & Assembly Funct Nanostruct, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[2] Chinese Acad Sci, Fujian Inst Res Struct Matter, Fujian Prov Key Lab Nanomat, Fuzhou 350002, Fujian, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
UP-CONVERSION NANOPARTICLES; CRYSTAL-STRUCTURE; MULTIFUNCTIONAL NANOPROBES; EMISSION PROPERTIES; NAYF4; NANOCRYSTALS; RARE-EARTH; LUMINESCENCE; ENHANCEMENT; PHASE; TB;
D O I
10.1039/c7tb00857k
中图分类号
TB3 [工程材料学]; R318.08 [生物材料学];
学科分类号
0805 ; 080501 ; 080502 ;
摘要
Lanthanide (Ln3+)-doped nanocrystals (NCs) have shown great promise in diverse bioapplications. Exploring new host materials to realize efficient downshifting (DS) and upconversion (UC) luminescence is a goal of general concern. Ln(3+)-doped oxybromides, which bring together the advantages of high chemical/thermal stability of oxides and low phonon energy of bromides, have been rarely reported so far. Herein, we report the synthesis of monodisperse tetragonal-phase LaOBr: Ln(3+) NCs via a modified thermal decomposition approach. Ln(3+) dopants in LaOBr NCs occupying surface and lattice sites were verified based on high-resolution photoluminescence spectra of Eu3+ at 10 K. Intense DS emissions were observed in Ce3+ and Ce3+/Tb3+ doped LaOBr NCs upon excitation at 353.0 nm, which is far from the deep-UV absorption band of proteins. Moreover, UC properties of LaOBr: Yb3+/Ho3+ and Yb3+/Er3+ NCs were comprehensively surveyed upon near-infrared excitation at 980 nm. Particularly, the red-togreen ratio can be markedly increased from 0.1 to similar to 300 in LaOBr: Yb3+/Er3+ NCs, resulting in high-chromatic-purity single-band red UC emission. Furthermore, we have employed the LaOBr: Ln(3+) NCs for cancer cell imaging by virtue of their superior optical properties, showing great potential of LaOBr:Ln(3+) nanoprobes in bioimaging.
引用
收藏
页码:4827 / 4834
页数:8
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