Julia Hesse, Dennis Tobias Klier, Massimo Sgarzi, Anne Nsubuga, Christoph Bauer, Joerg Grenzer, Rene Hübner, Marcus Wislicenus, Tanmaya Joshi, Michael Uwe Kumke, Holger Stephan
- We report a simple one-pot method for the rapid preparation of sub-10nm pure hexagonal (-phase) NaYF4-based upconverting nanoparticles (UCNPs). Using Therminol((R))66 as a co-solvent, monodisperse UCNPs could be obtained in unusually short reaction times. By varying the reaction time and reaction temperature, it was possible to control precisely the particle size and crystalline phase of the UCNPs. The upconversion (UC) luminescence properties of the nanocrystals were tuned by varying the concentrations of the dopants (Nd3+ and Yb3+ sensitizer ions and Er3+ activator ions). The size and phase-purity of the as-synthesized core and core-shell nanocrystals were assessed by using complementary transmission electron microscopy, dynamic light scattering, X-ray diffraction, and small-angle X-ray scattering studies. In-depth photophysical evaluation of the UCNPs was pursued by using steady-state and time-resolved luminescence spectroscopy. An enhancement in the UC intensity was observed if the nanocrystals, doped with optimized concentrationsWe report a simple one-pot method for the rapid preparation of sub-10nm pure hexagonal (-phase) NaYF4-based upconverting nanoparticles (UCNPs). Using Therminol((R))66 as a co-solvent, monodisperse UCNPs could be obtained in unusually short reaction times. By varying the reaction time and reaction temperature, it was possible to control precisely the particle size and crystalline phase of the UCNPs. The upconversion (UC) luminescence properties of the nanocrystals were tuned by varying the concentrations of the dopants (Nd3+ and Yb3+ sensitizer ions and Er3+ activator ions). The size and phase-purity of the as-synthesized core and core-shell nanocrystals were assessed by using complementary transmission electron microscopy, dynamic light scattering, X-ray diffraction, and small-angle X-ray scattering studies. In-depth photophysical evaluation of the UCNPs was pursued by using steady-state and time-resolved luminescence spectroscopy. An enhancement in the UC intensity was observed if the nanocrystals, doped with optimized concentrations of lanthanide sensitizer/activator ions, were further coated with an inert/active shell. This was attributed to the suppression of surface-related luminescence quenching effects.…
MetadatenAuthor details: | Julia Hesse, Dennis Tobias KlierGND, Massimo SgarziORCiD, Anne Nsubuga, Christoph Bauer, Joerg Grenzer, Rene Hübner, Marcus Wislicenus, Tanmaya Joshi, Michael Uwe KumkeORCiDGND, Holger StephanORCiD |
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DOI: | https://doi.org/10.1002/open.201700186 |
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ISSN: | 2191-1363 |
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Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/29435401 |
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Title of parent work (English): | ChemistryOpen : including thesis treasury |
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Publisher: | Wiley-VCH |
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Place of publishing: | Weinheim |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/01/25 |
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Publication year: | 2018 |
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Release date: | 2022/02/03 |
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Tag: | core-shell materials; lanthanides; nanostructures; photoluminescence; upconversion |
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Volume: | 7 |
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Issue: | 2 |
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Number of pages: | 10 |
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First page: | 159 |
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Last Page: | 168 |
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Funding institution: | Helmholtz Initiative and Networking Fund [Functional Nanomaterials for Multimodality Cancer Imaging (NanoTracking)] [VH-VI-421]; Helmholtz-Zentrum Dresden-Rossendorf fellowship; Alexander von Humboldt Foundation research fellowshipAlexander von Humboldt Foundation |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Gold Open-Access |
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| DOAJ gelistet |
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License (German): | CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International |
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