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Upconverting nanoparticles for nanoscale thermometry.

Lorenz H Fischer¹, Gregory S Harms, Otto S Wolfbeis

¹Institut für Analytische Chemie, Chemo- und Biosensorik, Universität Regensburg, Germany.

Angewandte Chemie (International Ed. in English)

|April 16, 2011

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Upconverting materials convert near-infrared light to luminescence, enabling nanoscale temperature sensing. The intensity ratio of emission bands offers a reliable method for optical thermometry, even within cells.

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Upconverting materials absorb near-infrared light and emit short-wavelength luminescence.
This upconversion process is sensitive to temperature variations.
Existing upconverting materials exhibit multiple emission bands with distinct temperature dependencies.

Purpose of the Study:

To explore the temperature-dependent properties of upconverting materials for nanoscale thermometry.
To establish a referenced signal for optical temperature sensing using the intensity ratio of emission bands.

Main Methods:

Characterization of upconverting materials' luminescence properties.
Analysis of the temperature dependence of individual emission bands.
Calculation of the intensity ratio between selected emission bands.

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Main Results:

Upconverting materials demonstrate temperature-dependent luminescence efficiency.
The ratio of intensities of specific emission bands provides a stable, referenced signal.
This ratio is suitable for accurate optical thermometry on the nanoscale.

Conclusions:

Upconverting materials offer a viable platform for nanoscale optical thermometry.
The intensity ratio method provides a robust, referenced approach for temperature sensing.
This technique has potential applications in biological systems, such as intracellular thermometry.