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	Monodisperse, size-tunable and highly efficient beta-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications
	Liu, Chenghui ; Wang, Hui ; Li, Xiao ; Chen, Depu
	2010-10-12 ; 2010-10-12
关键词	NAYF4 NANOCRYSTALS OPTICAL-PROPERTIES HEXAGONAL-PHASE NAYF4-YB,ER NANOPARTICLES FLUORESCENCE MECHANISMS PHOSPHORS SHAPE Chemistry, Physical Materials Science, Multidisciplinary
中文摘要	Monodisperse, oil-dispersible beta-NaYF4:Yb,Er(Tm) up-conversion (UC) luminescent nanospheres (NPs) have been successfully synthesized. The as-prepared NPs show high size-uniformity without any size-selection process, and the sizes of the NPs can be tuned in the range of 18 nm-45 nm, which are well suitable for biolabels. The NPs are thoroughly characterized and a growth mechanism is proposed. By co-doping Yb-Er or Yb-Tm, the as-prepared NPs can show bright green or blue UC luminescence under the irradiation of a 980 nm near-infrared (NIR) laser, and the UC luminescence can be obviously enhanced by constructing a NaYF4:Yb,Er@NaYF4 core/shell structure. Furthermore, the hydrophobic UC nanospheres (UCNPs) are converted into water-soluble by a robust ligand-exchange pathway with poly(acrylic acid). The presence of free carboxylic acid groups on their surfaces not only results in high solubility in water, but also allows further conjugation with biomolecules such as antigens, antibodies and oligonucleotides, which pave the way for potential bio-applications of the UCNPs.
语种	英语 ; 英语
出版者	ROYAL SOC CHEMISTRY ; CAMBRIDGE ; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/81081]
专题	清华大学
推荐引用方式 GB/T 7714	Liu, Chenghui,Wang, Hui,Li, Xiao,et al. Monodisperse, size-tunable and highly efficient beta-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications[J],2010, 2010.
APA	Liu, Chenghui,Wang, Hui,Li, Xiao,&Chen, Depu.(2010).Monodisperse, size-tunable and highly efficient beta-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications..
MLA	Liu, Chenghui,et al."Monodisperse, size-tunable and highly efficient beta-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications".(2010).

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