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Evaluation of rare earth doped silica sub-micrometric spheres as optically controlled temperature sensors
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10.1063/1.4751349
/content/aip/journal/jap/112/5/10.1063/1.4751349
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/5/10.1063/1.4751349

Figures

Image of FIG. 1.
FIG. 1.

(a) TEM micrograph of RE3+ doped sub-micrometer spheres after annealing. (b) Histogram of the height distribution of the microspheres; the red line is the Gaussian fit of the histogram and results in a mean size of 593 ± 3 nm of the particles.

Image of FIG. 2.
FIG. 2.

Evidence of trapping of the RE3+ doped microspheres. The sequence represents the movement of a single sphere (marked in a red-circle in the first image and only with a red-arrow in the rest) in a horizontal line while the rest of the spheres (marked with black-circles) continues with their free movement, with a trapping threshold of 10 mW.

Image of FIG. 3.
FIG. 3.

(a) Emission spectra of the Eu3+ doped SiO2 microspheres after optical excitation at 405 nm. (b) Detail of the Eu3+ transition centred at around 615 nm at low and high temperature, (c) shift of this peak with temperature. (d) Detail of the Eu3+ transition centred at around 700 nm at 30 °C and 75 °C, (e) intensity ratio of the two indicated peaks with temperature.

Image of FIG. 4.
FIG. 4.

(a) Emission spectra of the Tb3+ doped SiO2 microspheres after optical excitation at 488 nm. (b) Detail of the Tb3+ transition centred at around 545 nm at 20 °C and 65 °C, (c) ratio of the two indicated peaks with temperature.

Image of FIG. 5.
FIG. 5.

(a) Emission spectra of the Er3+ doped SiO2 microspheres after optical excitation at 488 nm. (b) Detail of the thermalized levels of Er3+ ions at 20 °C and 55 °C, (c) intensity ratio of the two emission band.

Tables

Generic image for table
Table I.

Different sensitivities and their corresponding sensing techniques for several Eu3+ doped materials.

Generic image for table
Table II.

Emission intensity ratio parameters and thermal sensitivities (37 °C) for different Er3+ doped material (spheres and SiO2 glass samples).

Generic image for table
Table III.

Summary of sensitivities and techniques used for the microspheres under investigation.

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/content/aip/journal/jap/112/5/10.1063/1.4751349
2012-09-12
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evaluation of rare earth doped silica sub-micrometric spheres as optically controlled temperature sensors
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/5/10.1063/1.4751349
10.1063/1.4751349
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