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

The Upconversion Luminescence of Er3+/Yb3+/Nd3+ Triply-Doped β-NaYF₄ Nanocrystals under 808-nm Excitation.

Author information

1
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. 12121711@bjtu.edu.cn.
2
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. zhengxu@bjtu.edu.cn.
3
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. slzhao@bjtu.edu.cn.
4
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. 11118404@bjtu.edu.cn.
5
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. 09273041@bjtu.edu.cn.
6
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. 12121659@bjtu.edu.cn.
7
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China. xrxu@bjtu.edu.cn.

Abstract

In this paper, Nd3+-Yb3+-Er3+-doped β-NaYF₄ nanocrystals with different Nd3+ 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 Nd3+ ion can absorb the photons effectively, and the Yb3+ ion can play the role of an energy-transfer bridging ion between the Nd3+ ion and Er3+ ion. To investigate the effect of the Nd3+ ion, the decay curves of the ⁴S3/2 → ⁴I15/2 transition at 540 nm are measured and analyzed. The NaYF₄: 20% Yb3+, 2% Er3+, 0.5% Nd3+ 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.

KEYWORDS:

Nd3+ concentration; mechanism; nanoparticles; upconversion

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