부산대학교 도서관

In this work, the physical characterization of LiGd[sub.x]Y[sub.1−x]F[sub.4] (x = 0.05, 0.3, 0.7, and 1.0) and LiGdF[sub.4]:Eu[sup.3+] microparticles was performed. The distribution coefficient of LiGd[sub.x]Y[sub.1−x]F[sub.4] (x = 0.05) was determined for the first time (0.84). Based on kinetic characterization data, the LiGdF[sub.4] sample was chosen for further Eu[sup.3+] doping (0.1 and 1.0 at.%). For the LiGdF[sub.4]:Eu[sup.3+] sample, Eu[sup.3+] emission was clearly observed under the excitation of Gd[sup.3+]. This fact indicates an effective energy transfer from Gd[sup.3+] to Eu[sup.3+]. The temperature-dependent spectral characterization of the LiGdF[sub.4]:Eu[sup.3+] (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 Eu[sup.3+] 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 Gd[sup.3+] and Eu[sup.3+] did not demonstrate a notable temperature dependence. The LiGdF[sub.4]:Eu[sup.3+] sample showed the possibility of being used as an optical temperature sensor, operating in the cryogenic temperature range.
Author(s): Ekaterina I. Oleynikova (corresponding author) [1,*]; Oleg A. Morozov [1,2]; Stella L. Korableva [1]; Maksim S. Pudovkin (corresponding author) [1,*] 1. Introduction Rare-earth-doped and un-doped nano- and microsized LiREF[sub.4] [...]