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Issue 22, 2012
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Photon upconverting nanoparticles for luminescent sensing of temperature

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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 °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 °C in the physiological range. The optical readout of this nanoparticle-based thermometer offers many options for imaging the two-dimensional distribution of temperature.

Graphical abstract: Photon upconverting nanoparticles for luminescent sensing of temperature

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Article information


Submitted
16 Aug 2012
Accepted
13 Sep 2012
First published
17 Sep 2012

Nanoscale, 2012,4, 7090-7096
Article type
Paper

Photon upconverting nanoparticles for luminescent sensing of temperature

A. Sedlmeier, D. E. Achatz, L. H. Fischer, H. H. Gorris and O. S. Wolfbeis, Nanoscale, 2012, 4, 7090 DOI: 10.1039/C2NR32314A

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