Temperature dependent photoluminescence down to 4.2K in EuTFC

Haugen, Øyvind Pernell; Johansen, T. H.

doi:10.1016/j.jlumin.2008.02.007

Cited by 10 publications

(15 citation statements)

References 14 publications

(13 reference statements)

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“…Figure 2 shows the characteristic emission spectra of EuTFC at room temperature and over a narrow wavelength scale, in arbitrary units as well, however here the units simply represent a digital signal without any absolute meaning. The peak emission was observed at 612.9 nm, which correlates with previous literature [14]. These results were used for selecting the optimal excitation light source and optical filters to use in the experimental setup.…”

Section: Absorption and Emissionsupporting

confidence: 85%

“…A year later, a temperature accuracy of 0.08 • C and a spatial resolution of 0.7 µm were reported. Haugen et al [13,14] then used FMI for the first time to image superconducting bridges carrying small amounts of currents and demonstrated that measurements are possible in superconductors down to 4.2 K.…”

Section: Fluorescent Microthermographic Imagingmentioning

confidence: 99%

“…In this paper, Europium tris[3-(trifluoromethyl-hydroxy-methylene)-(+)-camphorate], abbreviated EuTFC, was used for high-speed fluorescent thermal imaging [13,14]. Fluorescence spectroscopy was done on a sample prepared as described in next section (Sample Preparation), in order to determine the optimal illumination wavelength, as well as to confirm the emission spectrum.…”

Section: Absorption and Emissionmentioning

confidence: 99%

“…Previous measurements have often used Hg-Xe lamps [13,14] and Hg-arc lamps [11,12,15] in a microscopy setup as a source for excitation for fluorescence. The light of the lamp was filtered, only allowing the necessary UV component to pass.…”

Section: Uv Excitation Lightmentioning

confidence: 99%

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High-speed fluorescent thermal imaging of quench propagation in high temperature superconductor tapes

Gyuráki

Sirois

Grilli

2018

Supercond. Sci. Technol.

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Fluorescent Microthermographic Imaging, a method using rare-earth fluorescent coatings with temperature-dependent light emission, was used for quench investigation in high temperature superconductors (HTS). A fluorophore was embedded in a polymer matrix and used as a coating on top of an HTS tape, while being excited with UV light and recorded with a high-speed camera. Simultaneously, the tape was pulsed with high amplitude, short duration DC current, and brought to quench with the help of a localized defect. The joule heating during a quench influences the fluorescent light intensity emitted from the coating, and by recording the local variations in this intensity over time, the heating of the tape can be visualized and the developed temperatures can be calculated. In this paper, the fluorophore Europium tris[3-(trifluoromethylhydroxymethylene)-(+)-camphorate] (EuTFC) provided sufficient temperature sensitivity and a usable temperature range from 77 K to 260 K. With the help of high-speed recordings, the normal zone development was imaged in a 20 µm copper stabilized HTS tape held in a liquid nitrogen bath, and using a calibration curve, the temperatures reached during the quench have been calculated.

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Section: Absorption and Emissionsupporting

confidence: 85%

Section: Fluorescent Microthermographic Imagingmentioning

confidence: 99%

Section: Absorption and Emissionmentioning

confidence: 99%

Section: Uv Excitation Lightmentioning

confidence: 99%

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High-speed fluorescent thermal imaging of quench propagation in high temperature superconductor tapes

Gyuráki

Sirois

Grilli

2018

Supercond. Sci. Technol.

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“…It not only serves to adhesion the paint to the model surface, but also has significant influence on the TSP properties including the temperature sensitivity and the response time as well. Haugen et al [11] reported the temperature sensitivity of europium tris[3-(trifluoromethylhydroxymethylene)-(+)-camphorate] (EuTFC) embedded in various polymer matrices such as polystyrene (PS), poly(butyl methacrylate) (PBMA), poly(ethyl methacrylate) (PEMA) and poly(methyl methacrylate) (PMMA) from 40 K down to 4.2 K. They found EuTFC/PBMA film has the largest temperature sensitivity of 1.0%/K at 4.2 K in cryogenic testing, and concluded that it was attributed the difference of the onset temperatures of several relaxation modes (,  and  relaxation, etc.). Basu et al [12] investigated the temperature dependence of the luminescence lifetime for the temperature sensor films based on europium(III) thenoyltrifluoroacetonate (EuTTA) as sensor dye in various polymer matrices such as PS, PMMA, polyurethane (PU) and a commercial dope for model airplane.…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer matrix on temperature sensitivity of temperature sensitive paints

Wang

Jin

et al. 2015

Chin J Polym Sci

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The thermal quenching behaviors of the temperature sensitivity paints (TSP) composed of europium(III) thenoyltrifluoroacetonate (EuTTA) and Eu-phenanthrene complex (Eu-2) in polystyrene (PS), polymethylmethacrylate (PMMA) and epoxy resin (EP) were investigated. It is found that both the emission intensity and temperature sensitivity were not only affected by the luminescence probes, but also by the polymer matrix. The interaction between probes and matrix results in the alteration of both the non-radiation decay rate and the activation energy of the non-radiative process for the thermal quenching process, i.e. larger activation energy of the non-radiative process shows higher temperature sensitivity and less emission intensity. Therefore, it was confirmed that the temperature sensitivity and luminescent intensity of TSP depended not only on the luminescence probes but also on the polymer matrix.

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