Temperature Sensing Based on Thermal Population of Low-Lying 7FJ Levels of Trivalent Europium ions in GdVO4

Temperature sensing performance of GdVO4: Eu3+ phosphors have been studied using a method based on thermal coupling of the low-lying levels (7FJ: J = 0, 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 -> 7F4 emission intensities when 5D0 excited from thermally populated lowlying excited states 7F1 and 7F2 with respect to 7F0 level. The luminescence intensity ratio monotonously increases with rising of temperature from 133 K to physiological temperature of 313 K. Specifically, the maximum value of relative sensitivity SR reach to 6.73% K-1 for first scheme and 2.87% K-1 for second scheme. The GdVO4:Eu3+ phosphor shows the excellent relative sensitivity of 1.23% K-1 in physiological temperature range (310 K), recommending its potential for applications in bio-medical field.

Automated summary

The temperature sensing performance of GdVO4: Eu3+ phosphors was studied using a method based on thermal coupling of the low-lying levels of Eu3+. The phosphors exhibit outstanding luminescence characteristics with high detection sensitivity, with the luminescence intensity ratio increasing monotonously with rising temperature.