Sedlmeier, Andreas and Achatz, Daniela E. and Fischer, Lorenz H. and Gorris, Hans H. and Wolfbeis, Otto S. (2012) Photon upconverting nanoparticles for luminescent sensing of temperature. NANOSCALE, 4 (22). pp. 7090-7096. ISSN 2040-3364, 2040-3372
Full text not available from this repository. (Request a copy)Abstract
Photon upconverting nanoparticles convert near-infrared into visible light (anti-Stokes emission), which strongly reduces the background of autofluorescence and light scattering in biological materials. Hexagonal NaYF4 nanocrystals doped with Yb3+ as the sensitizer and Er3+/Ho3+/Tm3+ as the activator display at least two emission lines that respond differently to temperature changes. The ratio of the main emission line intensities enables a self-referenced optical readout of the temperature in the physiologically relevant range from 20 to 45 degrees C. Upconverting nanoparticles of the type NaYF4:Yb, Er covered by an inactive shell of NaYF4 are bright and allow for resolving temperature differences of less than 0.5 degrees C in the physiological range. The optical readout of this nanoparticle-based thermometer offers many options for imaging the two-dimensional distribution of temperature.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | UP-CONVERSION FLUORESCENCE; MICROFLUIDIC SYSTEMS; NANOCRYSTALS; THERMOMETRY; MICRODROPLETS; SENSITIVITY; EMISSION; TERBIUM; PROBES; SENSOR; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) Chemistry and Pharmacy > Central Analytical Services |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 May 2020 06:52 |
| Last Modified: | 15 May 2020 06:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19419 |
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