Particle-Size-Dependent Förster Resonance Energy Transfer from Upconversion Nanoparticles to Organic Dyes
| Autor: | Marco Kraft, Antje J. Baeumner, Markus Buchner, Ute Resch-Genger, Christian Würth, Thomas Hirsch, Verena Muhr |
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| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
Sulforhodamine B 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Acceptor Photon upconversion 0104 chemical sciences Analytical Chemistry Ion chemistry.chemical_compound Förster resonance energy transfer chemistry Molecule Particle size 0210 nano-technology |
| Zdroj: | Analytical chemistry. 89(9) |
| ISSN: | 1520-6882 |
| Popis: | Upconversion nanoparticles (UCNPs) are attractive candidates for energy transfer-based analytical applications. In contrast to classical donor-acceptor pairs, these particles contain many emitting lanthanide ions together with numerous acceptor dye molecules at different distances to each other, strongly depending on the particle diameter. UCNPs with precisely controlled sizes between 10 and 43 nm were prepared and functionalized with rose bengal and sulforhodamine B by a ligand-exchange procedure. Time-resolved studies of the upconversion luminescence of the UCNP donor revealed a considerable shortening of the donor lifetime as a clear hint for Förster resonance energy transfer (FRET). FRET was most pronounced for 21 nm-sized UCNPs, yielding a FRET efficiency of 60%. At larger surface-to-volume ratios, the FRET efficiency decreased by an increasing competition of nonradiative surface deactivation. Such dye-UCNP architectures can also provide an elegant way to shift the UCNP emission color, since the fluorescence intensity of the organic dyes excited by FRET was comparable to that of the upconversion emission of smaller particles. |
| Databáze: | OpenAIRE |
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