Optical Materials | 2021
Temperature Sensing Based on Thermal Population of Low-Lying 7F Levels of Trivalent Europium ions in GdVO4
Abstract
Abstract Temperature sensing performance of GdVO4: Eu3+ phosphors have been studied using a method based on thermal coupling of the low-lying levels (7FJ: J\xa0=\xa00, 1, 2) of Eu3+. GdVO4: Eu3+ phosphors exhibit the outstanding luminescence characteristics with temperature and high detection sensitivity. Luminescence intensity ratio has been investigated between the 5D0 â 7F4 emission intensities when 5D0 excited from thermally populated low-lying excited states 7F1 and 7F2 with respect to 7F0 level. The luminescence intensity ratio monotonously increases with rising of temperature from 133\xa0K to physiological temperature of 313\xa0K. Specifically, the maximum value of relative sensitivity SR reach to 6.73% Kâ1 for first scheme and 2.87% Kâ1 for second scheme. The GdVO4:Eu3+ phosphor shows the excellent relative sensitivity of 1.23% Kâ1 in physiological temperature range (310\xa0K), recommending its potential for applications in bio-medical field.