Muhr, Verena and Wuerth, Christian and Kraft, Marco and Buchner, Markus and Baeumner, Antje J. and Resch-Genger, Ute and Hirsch, Thomas (2017) Particle-Size-Dependent Forster Resonance Energy Transfer from Upconversion Nanoparticles to Organic Dyes. ANALYTICAL CHEMISTRY, 89 (9). pp. 4868-4874. ISSN 0003-2700, 1520-6882
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Upconversion nanoparticles (UCNPs) are attractive candidates for energy transfer-based analytical applications. In contrast to classical donoracceptor 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 Forster 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | UPCONVERTING NANOPARTICLES; BIOIMAGING APPLICATIONS; DOPED NANOPARTICLES; VERSATILE PLATFORM; FLUORESCENT-PROBES; CANCER-CELLS; NANOCRYSTALS; LUMINESCENCE; THERAPY; FRET; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 20 Feb 2019 07:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/898 |
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