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Enhanced Red Emission from GdF 3 :Yb 3+ ,Er 3+ Upconversion Nanocrystals by Li + Doping and Their Application for Bioimaging
Author(s) -
Yin Wenyan,
Zhao Lina,
Zhou Liangjun,
Gu Zhanjun,
Liu Xiaoxiao,
Tian Gan,
Jin Shan,
Yan Liang,
Ren Wenlu,
Xing Gengmei,
Zhao Yuliang
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201053
Subject(s) - photon upconversion , materials science , nanocrystal , dopant , biocompatibility , hydrothermal circulation , doping , excitation , nanotechnology , optoelectronics , chemical engineering , electrical engineering , engineering , metallurgy
Under 980 nm near‐infrared (NIR) excitation, upconversion luminescent (UCL) emission of GdF 3 :Yb,Er upconversion nanoparticles (UCNPs) synthesized by a simple and green hydrothermal process can be tuned from yellow to red by varying the concentration of dopant Li + ions. A possible mechanism for enhanced red upconverted radiation is proposed. A layer of silica was coated onto the surface of GdF 3 :Yb,Er,Li UCNPs to improve their biocompatibility. The silica‐coated GdF 3 :Yb,Er,Li UCNPs show great advantages in cell labeling and in vivo optical imaging. Moreover, GdF 3 UCNPs also exhibited a positive contrast effect in T 1 ‐weighted magnetic resonance imaging (MRI). These results suggest that the GdF 3 UCNPs could act as dual‐modality biolabels for optical imaging and MRI.
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