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Article

Upconversion Nanocrystal Doped Polymer Fiber Thermometer

1
Institut of Quantum Optics, Leibniz University Hannover, Welfengarten 1, D-30167 Hannover, Germany
2
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany
3
TU Braunschweig, Institut für Hochfrequenztechnik, Schleinitzstaße 22, D-38106 Braunschweig, Germany
4
Academic Alliance Braunschweig-Hannover QUANOMET, 30167 Hannover, Germany
5
Cluster of Excellence PhoenixD, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(21), 6048; https://doi.org/10.3390/s20216048
Received: 4 September 2020 / Revised: 16 October 2020 / Accepted: 20 October 2020 / Published: 24 October 2020
(This article belongs to the Special Issue Recent Development and Applications of Plastic Optical Fiber Sensors)
In recent years, lanthanide-doped nanothermometers have been mainly used in thin films or dispersed in organic solvents. However, both approaches have disadvantages such as the short interaction lengths of the active material with the pump beam or complicated handling, which can directly affect the achievable temperature resolution. We investigated the usability of a polymer fiber doped with upconversion nanocrystals as a thermometer. The fiber was excited with a wavelength stabilized diode laser at a wavelength of 976 nm. Emission spectra were recorded in a temperature range from 10 to 35 C and the thermal emission changes were measured. Additionally, the pump power was varied to study the effect of self-induced heating on the thermometer specifications. Our fiber sensor shows a maximal thermal sensitivity of 1.45%/K and the minimal thermal resolution is below 20 mK. These results demonstrate that polymer fibers doped with nanocrystals constitute an attractive alternative to conventional fluorescence thermometers, as they add a long pump interaction length while also being insensitive to strong electrical fields or inert to bio-chemical environments. View Full-Text
Keywords: upconversion nanocrystals; polymer fiber; optical thermometer upconversion nanocrystals; polymer fiber; optical thermometer
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MDPI and ACS Style

Thiem, J.; Spelthann, S.; Neumann, L.; Jakobs, F.; Johannes, H.-H.; Kowalsky, W.; Kracht, D.; Neumann, J.; Ruehl, A.; Ristau, D. Upconversion Nanocrystal Doped Polymer Fiber Thermometer. Sensors 2020, 20, 6048. https://doi.org/10.3390/s20216048

AMA Style

Thiem J, Spelthann S, Neumann L, Jakobs F, Johannes H-H, Kowalsky W, Kracht D, Neumann J, Ruehl A, Ristau D. Upconversion Nanocrystal Doped Polymer Fiber Thermometer. Sensors. 2020; 20(21):6048. https://doi.org/10.3390/s20216048

Chicago/Turabian Style

Thiem, Jonas, Simon Spelthann, Laurie Neumann, Florian Jakobs, Hans-Hermann Johannes, Wolfgang Kowalsky, Dietmar Kracht, Joerg Neumann, Axel Ruehl, and Detlev Ristau. 2020. "Upconversion Nanocrystal Doped Polymer Fiber Thermometer" Sensors 20, no. 21: 6048. https://doi.org/10.3390/s20216048

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