Automated phosphor thermometry lifetime calibration of multiple phosphors and emission lines to above 1900 K

Feuk, Henrik; Nilsson, Sebastian; Richter, Mattias

doi:10.1088/1361-6501/ac8e21

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…The UV downconversion emission spectra were performed with the third harmonic (355 nm) from a 5 ns pulse duration The presented emission spectra are averages of 100 single-shot emission spectra. The same 10 Hz laser system was used for downconversion lifetime calibrations with 355 nm excitation wavelength with the same calibration methodology developed in [25].…”

Section: Methodsmentioning

confidence: 99%

Upconversion phosphor thermometry for use in thermal barrier coatings

Feuk

Nilsson²,

Richter³

2023

Meas. Sci. Technol.

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Measuring the temperature below the surface of a thermal barrier coating (TBC) using a thin phosphor layer is challenging primarily due to the absorption and scattering of laser excitation light and phosphor luminescence as they propagate through the coating. One way to increase phosphor luminescence could be to use upconversion phosphor thermometry, which is investigated in the current study. It is attractive because using longer excitation wavelengths reduces the absorption and scattering in TBCs as 8 % wt. Yttria-Stabilize Zirconia (8YSZ) generally has lower scattering and absorption coefficients around 1000 nm than at 532 and 355 nm. Therefore, the viability of upconversion to measure the temperature at the bottom of a TBC was evaluated for the first time and was compared with the more conventional downconversion phosphor thermometry. The current work involved an experimental study of several phosphors with lanthanides doped in the 8YSZ host, which were excited through downconversion by pulsed 355 nm and 532 nm laser light and through upconversion with 965 nm laser light. The YSZ:Er,Yb and YSZ:Ho,Yb phosphors show promise for upconversion phosphor thermometry. The experimentally acquired optical phosphor characteristics were used to simulate laser light and phosphor luminescence propagation in TBCs using Kubelka-Munk theory. This was to evaluate the signal strength with upconversion excitation compared to downconversion excitation. Upconversion excitation resulted greater signal strength from an embedded phosphor layer than 532 nm excitation and much higher than 355 nm excitation. Upconversion lifetime phosphor thermometry also resulted in improved phosphor lifetime temperature sensitivity. Coupled with reduced interference from background luminescence from impurities in TBCs with upconversion, it is a promising method for temperature measurements with the thermographic phosphor embedded in or underneath a TBC.

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Section: Methodsmentioning

confidence: 99%