Rare-Earth Nanoparticles with Enhanced Upconversion Emission and Suppressed Rare-Earth-Ion Leakage

被引：191

作者：

Wang, Ye-Fu ^{[1
]}

Sun, Ling-Dong ^{[1
]}

Xiao, Jia-Wen ^{[1
]}

Feng, Wei ^{[1
]}

Zhou, Jia-Cai ^{[1
]}

Shen, Jie ^{[1
]}

Yan, Chun-Hua ^{[1
]}

机构：

[1] Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, Beijing 100871, Peoples R China

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2012年 / 18卷 / 18期

关键词：

cell imaging; core; shell nanoparticles; heterostructures; rare-earth metals; upconversion; NANOCRYSTALS; LUMINESCENCE; FLUORESCENCE; CORE; NANOPHOSPHORS; NANOPROBES; GADOLINIUM; STRATEGY; CDSE;

D O I：

10.1002/chem.201103485

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Upconversion emissions from rare-earth nanoparticles have attracted much interest as potential biolabels, for which small particle size and high emission intensity are both desired. Herein we report a facile way to achieve NaYF4:Yb,Er@CaF2 nanoparticles (NPs) with a small size (1013 nm) and highly enhanced (ca. 300 times) upconversion emission compared with the pristine NPs. The CaF2 shell protects the rare-earth ions from leaking, when the nanoparticles are exposed to buffer solution, and ensures biological safety for the potential bioprobe applications. With the upconversion emission from NaYF4:Yb,Er@CaF2 NPs, HeLa cells were imaged with low background interference.

引用

页码：5558 / 5564

页数：7

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