Temperature sensing from the emission rise times of Eu~(3+)in SrY2O4

摘要

The emission rise time of Eu~(3+)-doped SrY2O4 was investigated in the temperature range of 20-200 °C for application in luminescence thermometry. After pulsed excitation, the energy transfer between the adjacent Eu~(3+) ions causes a emission build-up from the ~5D0 level of Eu~(3+) and a notable emission rise occurs prior to decay. The emission rise-time values linearly decrease with temperature, providing an absolute sensitivity of 0.66 μs °C~(-1) and a maximal relative sensitivity of 5.53% °C~(-1) at 200 °C, for samples containing 0.5 at% Eu~(3+) ions, it is shown that the time after excitation at which emission reaches a maximum (time-to-max) can also be exploited for temperature sensing, since it is easily measurable and shows a linear dependence with temperature.