Water-soluble NaYF4:Yb,Er(Tm)/NaYF4/polymer core/shell/shell nanoparticles with significant enhancement of upconversion fluorescence

被引:694
作者
Yi, Guang-Shun
Chow, Gan-Moog
机构
[1] Department of Materials Science and Engineering, National University of Singapore
关键词
D O I
10.1021/cm062447y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hexagonal bulk nanoparticles of NaYF4:Yb,Er(Tm) were prepared by solid-state or hydrothermal reaction. These hexagonal phase NaYF 4:Yb,Er(Tm) nanoparticles of small size and narrow size distribution were hydrophobic with lower fluorescence compared to the bulk counterparts. These hydrophobic C/S nanoparticles rendered hydrophobic by a layer of amphiphilic polymer. The polymer coated C/S nanoparticles synthesized contain an amphiphilic layer, 25% octylamine, and 40% isopropylamine modified poly(acrylic acid) (PAA). The organic surfactant with high vibrational energy on the nanoparticle surface quench fluorescence. The transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) images of NaYF4:Yb,Er(Tm) confirm single crystallinity. The results show major upconversion fluorescence enhancements of 7.4 times from NaYF4:Yb, Er C/S and 29.6 times from NaYF4:Yb, Tm C/S.
引用
收藏
页码:341 / 343
页数:3
相关论文
共 24 条
[1]   Synthesis of colloidal upconverting NaYF4 nanocrystals doped with Er3+, Yb3+ and Tm3+, Yb3+ via thermal decomposition of lanthanide trifluoroacetate precursors [J].
Boyer, John-Christopher ;
Vetrone, Fiorenzo ;
Cuccia, Louis A. ;
Capobianco, John A. .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (23) :7444-7445
[2]   Quantum dot bioconjugates for ultrasensitive nonisotopic detection [J].
Chan, WCW ;
Nie, SM .
SCIENCE, 1998, 281 (5385) :2016-2018
[3]   In vivo imaging of quantum dots encapsulated in phospholipid micelles [J].
Dubertret, B ;
Skourides, P ;
Norris, DJ ;
Noireaux, V ;
Brivanlou, AH ;
Libchaber, A .
SCIENCE, 2002, 298 (5599) :1759-1762
[4]   Imaging plant cells by two-photon excitation [J].
Feijó, JA ;
Moreno, N .
PROTOPLASMA, 2004, 223 (01) :1-32
[5]   In vivo cancer targeting and imaging with semiconductor quantum dots [J].
Gao, XH ;
Cui, YY ;
Levenson, RM ;
Chung, LWK ;
Nie, SM .
NATURE BIOTECHNOLOGY, 2004, 22 (08) :969-976
[6]   Highly efficient multicolour upconversion emission in transparent colloids of lanthanide-doped NaYF4 nanocrystals [J].
Heer, S ;
Kömpe, K ;
Güdel, HU ;
Haase, M .
ADVANCED MATERIALS, 2004, 16 (23-24) :2102-+
[7]   Synthesis and characterization of strongly luminescing ZnS-Capped CdSe nanocrystals [J].
Hines, MA ;
Guyot-Sionnest, P .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (02) :468-471
[8]   Green-emitting CePO4:Th/LaPO4 core-shell nanoparticles with 70% photoluminescence quantum yield [J].
Kömpe, K ;
Borchert, H ;
Storz, J ;
Lobo, A ;
Adam, S ;
Möller, T ;
Haase, M .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2003, 42 (44) :5513-5516
[9]   Hexagonal sodium yttrium fluoride based green and blue emitting upconversion phosphors [J].
Krämer, KW ;
Biner, D ;
Frei, G ;
Güdel, HU ;
Hehlen, MP ;
Lüthi, SR .
CHEMISTRY OF MATERIALS, 2004, 16 (07) :1244-1251
[10]   Enhanced blue and green upconversion in hydrothermally synthesized hexagonal NaY1-xYbxF4:Ln3+ (Ln3+ = Er3+ or Tm3+) [J].
Liang, LF ;
Wu, H ;
Hu, HL ;
Wu, MM ;
Su, Q .
JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 368 (1-2) :94-100