Using NMR Relaxometry to Probe Yb³⁺–Er³⁺ Interactions in Highly Doped Nanocrystalline NaYF₄ Nanostructures
2018
Martin, M. N. | Newman, T. | Zhang, M. | Sun, L. D. | Yan, C. H. | Liu, G. Y. | Augustine, M. P.
Solid-state nuclear magnetic resonance (NMR) spectroscopy is used to study heavily Yb³⁺ and Er³⁺ doped, fluorescent NaY₁–ₓ–yYbₓEryF₄ nanoparticles. An understanding of the ¹⁹F wide line NMR response suggests that the 0 ppm portion of the ¹⁹F NMR spectrum can be used as a probe of trivalent lanthanide content via spin–lattice relaxation time changes. A Yb³⁺ and Er³⁺ magnetic interaction is manifest as a cooperative contribution to the ¹⁹F spin–lattice relaxation rate in heavily co-doped nanoparticle samples. The results from this study will aid in the understanding of the mechanism of enhanced optical up-conversion among these well-known nanostructures.
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