Journal
MATERIALS
Volume 7, Issue 11, Pages 7289-7303Publisher
MDPI
DOI: 10.3390/ma7117289
Keywords
upconversion; nanoparticles; Nd3+ concentration; mechanism
Categories
Funding
- National Grand Fundamental Research 973 Program of China [2010CB327704]
- National Natural Science Foundation of China [51272022]
- National High Technology Research and Development Program of China (863 Program) [2013AA032205]
- New Century Excellent Talents in University [NCET-10-0220]
- Research Fund for the Doctoral Program of Higher Education [20120009130005, 20130009130001]
- Fundamental Research Funds for the Central Universities [2012JBZ001]
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In this paper, Nd3+-Yb3+-Er3+-doped beta-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+ (i)on 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 S-4(3/2) -> I-4(15/2) 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.
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