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Understanding the Role of Yb(3+) in the Nd/Yb Coupled 808-nm-Responsive Upconversion
The realization of upconversion at 808 nm excitation has shown great advantages in advancing the broad bioapplications of lanthanide-doped nanomaterials. In an 808 nm responsive system, Nd(3+) and Yb(3+) are both needed where Nd(3+) acts as a sensitizer through absorbing the excitation irradiation....
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6355672/ https://www.ncbi.nlm.nih.gov/pubmed/30740392 http://dx.doi.org/10.3389/fchem.2018.00673 |
Sumario: | The realization of upconversion at 808 nm excitation has shown great advantages in advancing the broad bioapplications of lanthanide-doped nanomaterials. In an 808 nm responsive system, Nd(3+) and Yb(3+) are both needed where Nd(3+) acts as a sensitizer through absorbing the excitation irradiation. However, few studies have been dedicated to the role of Yb(3+). Here, we report a systemic investigation on the role of Yb(3+) by designing a set of core-shell-based nanostructures. We find that energy migration over the ytterbium sublattice plays a key role in facilitating the energy transportation, and moreover, we show that the interfacial energy transfer occurring at the core-shell interface also has a contribution to the upconversion. By optimizing the dopant concentration and surface anchoring the infrared indocyanine green dye, the 808 nm responsive upconversion is markedly enhanced. These results present an in-depth understanding of the fundamental interactions among lanthanides, and more importantly, they offer new possibilities to tune and control the upconversion of lanthanide-based luminescent materials. |
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