LiGdxY1−xF4 and LiGdF4:Eu3+ Microparticles as Potential Materials for Optical Temperature Sensing

Author:

Oleynikova Ekaterina I.1,Morozov Oleg A.12ORCID,Korableva Stella L.1ORCID,Pudovkin Maksim S.1ORCID

Affiliation:

1. Institute of Physics, Kazan Federal University, 18 Kremlyovskaya str, 420008 Kazan, Russia

2. Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Sibirsky Trakt str. 10, 420029 Kazan, Russia

Abstract

In this work, the physical characterization of LiGdxY1−xF4 (x = 0.05, 0.3, 0.7, and 1.0) and LiGdF4:Eu3+ microparticles was performed. The distribution coefficient of LiGdxY1−xF4 (x = 0.05) was determined for the first time (0.84). Based on kinetic characterization data, the LiGdF4 sample was chosen for further Eu3+ doping (0.1 and 1.0 at.%). For the LiGdF4:Eu3+ sample, Eu3+ emission was clearly observed under the excitation of Gd3+. This fact indicates an effective energy transfer from Gd3+ to Eu3+. The temperature-dependent spectral characterization of the LiGdF4:Eu3+ (1.0%) sample revealed that in the 30–250 K temperature range, a broad emission peak is evidenced. Its intensity sharply increases with the temperature decrease. We made a suggestion that this phenomenon is related to the irradiation-induced defects. The integrated luminescence intensity ratio of this broad peak and the Eu3+ emission were taken as temperature-dependent parameters. The sensitivity values are very competitive, and the first maximum occurs at 174 K (3.18%/K). The kinetic characteristics of both Gd3+ and Eu3+ did not demonstrate a notable temperature dependence. The LiGdF4:Eu3+ sample showed the possibility of being used as an optical temperature sensor, operating in the cryogenic temperature range.

Funder

subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities

Russian Science Foundation

Publisher

MDPI AG

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