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

来源：

CHEMISTRY OF MATERIALS | 2007年 / 19卷 / 03期

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

页码：341 / 343

页数：3

共 24 条

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