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

Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China
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Materials 2014, 7(11), 7289-7303; https://doi.org/10.3390/ma7117289
Received: 14 June 2014 / Revised: 10 October 2014 / Accepted: 30 October 2014 / Published: 4 November 2014
(This article belongs to the Section Structure Analysis and Characterization)
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 4S3/24I15/2 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. View Full-Text
Keywords: upconversion; nanoparticles; Nd3+ concentration; mechanism upconversion; nanoparticles; Nd3+ concentration; mechanism
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Tian, L.; Xu, Z.; Zhao, S.; Cui, Y.; Liang, Z.; Zhang, J.; Xu, X. The Upconversion Luminescence of Er3+/Yb3+/Nd3+ Triply-Doped β-NaYF4 Nanocrystals under 808-nm Excitation. Materials 2014, 7, 7289-7303.

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