Confining Excitation Energy in Er3+-Sensitized Upconversion Nanocrystals through Tm3+-Mediated Transient Energy Trapping

被引：308

作者：

Chen, Qiushui ^{[1
,2
,6
]}

Xie, Xiaoji ^{[3
,4
]}

Huang, Bolong ^{[5
]}

Liang, Liangliang ^{[6
]}

Han, Sanyang ^{[6
]}

Yi, Zhigao ^{[6
]}

Wang, Yu ^{[1
,2
]}

Li, Ying ^{[1
,2
]}

Fan, Dianyuan ^{[1
,2
]}

Huang, Ling ^{[3
,4
]}

Liu, Xiaogang ^{[6
]}

机构：

[1] Shenzhen Univ, NUS SZU Collaborat Innovat Ctr Optoelect Sci & Te, Key Lab Optoelect Devices & Syst, Minist Educ, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Guangdong Prov Coll Optoelect Engn, Shenzhen 518060, Peoples R China

[3] Nanjing Univ Technol, Key Lab Flexible Elect, Nanjing 211816, Jiangsu, Peoples R China

[4] Nanjing Univ Technol, Jiangsu Natl Synergist Innovat Ctr Adv Mat, Inst Adv Mat, Nanjing 211816, Jiangsu, Peoples R China

[5] Hong Kong Polytech Univ, Dept Appl Biol & Chem Technol, Kowloon, Hong Kong, Peoples R China

[6] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2017年 / 56卷 / 26期

基金：

新加坡国家研究基金会; 中国国家自然科学基金;

关键词：

energy migration; Er3+ sensitizers; optical imaging; transient energy trapping; upconversion nanocrystals; LANTHANIDE-DOPED NANOCRYSTALS; IN-VIVO; UPCONVERTING NANOPARTICLES; EMISSION; PHOTOLUMINESCENCE; LUMINESCENCE; NANOPROBES; MIGRATION; SURFACE; CELL;

D O I：

10.1002/anie.201703012

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A new class of lanthanide-doped upconversion nanoparticles are presented that are without Yb3+ or Nd3+ sensitizers in the host lattice. In erbium-enriched core-shell NaErF4:Tm (0.5 mol%)@ NaYF4 nanoparticles, a high degree of energy migration between Er3+ ions occurs to suppress the effect of concentration quenching upon surface coating. Unlike the conventional Yb3+-Er3+ system, the Er3+ ion can serve as both the sensitizer and activator to enable an effective upconversion process. Importantly, an appropriate doping of Tm3+ has been demonstrated to further enhance upconversion luminescence through energy trapping. This endows the resultant nanoparticles with bright red (about 700-fold enhancement) and near-infrared luminescence that is achievable under multiple excitation wavelengths. This is a fundamental new pathway to mitigate the concentration quenching effect, thus offering a convenient method for red-emitting upconversion nanoprobes for biological applications.

引用

页码：7605 / 7609

页数：5

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