808纳米激发下Er/Yb/Nd三掺杂β-NaYF₄纳米晶体的上转换发光

The Upconversion Luminescence of Er/Yb/Nd Triply-Doped β-NaYF₄ Nanocrystals under 808-nm Excitation.

作者信息

Tian Lijiao, Xu Zheng, Zhao Suling, Cui Yue, Liang Zhiqin, Zhang Junjie, Xu Xurong

机构信息

Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China.

出版信息

Materials (Basel). 2014 Nov 4;7(11):7289-7303. doi: 10.3390/ma7117289.

DOI:10.3390/ma7117289

PMID:28788246

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5512635/

Abstract

In this paper, Nd-Yb-Er-doped β-NaYF₄ nanocrystals with different Nd concentrations are synthesized, and the luminescence properties of the upconversion nanoparticles (UCNPs) have been studied under 808-nm excitation for sensitive biological applications. The upconversion luminescence spectra of NaYF₄ nanoparticles with different dopants under 808-nm excitation proves that the Nd ion can absorb the photons effectively, and the Yb ion can play the role of an energy-transfer bridging ion between the Nd ion and Er ion. To investigate the effect of the Nd ion, the decay curves of the ⁴S → ⁴I transition at 540 nm are measured and analyzed. The NaYF₄: 20% Yb, 2% Er, 0.5% Nd nanocrystals have the highest emission intensity among all samples under 808-nm excitation. The UC (upconversion) mechanism under 808-nm excitation is discussed in terms of the experimental results.

摘要

本文合成了不同钕（Nd）浓度的钕-镱-铒掺杂β-NaYF₄纳米晶体，并研究了上转换纳米粒子（UCNPs）在808 nm激发下的发光特性，以用于灵敏的生物应用。808 nm激发下不同掺杂剂的NaYF₄纳米粒子的上转换发光光谱证明，Nd离子能够有效地吸收光子，而Yb离子可以在Nd离子和Er离子之间起到能量转移桥接离子的作用。为了研究Nd离子的影响，测量并分析了540 nm处⁴S→⁴I跃迁的衰减曲线。在808 nm激发下，NaYF₄:20%Yb、2%Er、0.5%Nd纳米晶体在所有样品中具有最高的发射强度。根据实验结果讨论了808 nm激发下的上转换（UC）机制。