A highly sensitive lifetime-based luminescent manometer and bi-functional pressure–temperature sensor based on a spectral shift of the R-line of Mn4+ in K2Ge4O9

As presented in the manuscript the K 2 Ge 4 O 9 :Mn 4+ can be used as a luminescent pressure and temperature sensor. The pressure sensing can be achieved based on the kinetics of the 2E state luminescence and the spectral position of the R line can be used for temperature sensing.