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Luminescent cryothermometer based on K2YF5 : Er3+
Boldyrev K. N.
1, Diab M.1,2, Khaidukov N. M.
3, Popova M. N.
1
1Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
2Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudnyi, Russia
3Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
2Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudnyi, Russia
3Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
Email: kn.boldyrev@gmail.com, diab.m@phystech.edu, khaiduk2@gmail.com, popova@isan.troitsk.ru
The luminescence spectra of the K2YF5 : Er3+ (0.5 at.%) were recorded in the spectral regions of the intermultiplet transitions ^4I13/2->^4I15/2 (region of about 1.5 μm, falling within the transparency window of a standard optical fiber) and ^4I11/2->^4I15/2 (region of about 0.98 μm) with high spectral resolution at different temperatures. Pairs of spectral lines are proposed for the implementation of a Boltzmann luminescent ratiometric cryothermometer in the temperature ranges of about 20, 40, and 60 K with a relative sensitivity of 8 to 3% K-1. It is shown that measuring the half-width of a luminescence line with a wavelength of 1.538 μm (6500 cm-1) provides a simple and reliable method for recording temperatures in the range from 20 to 90 K with a relative sensitivity of 3 to 2% K-1. Keywords: luminescence cryothermometry, K2YF5 : Er3+ crystal, high-resolution Fourier transform spectroscopy.
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