Moreover, the luminescence intensity ratio of Tb3+/Mn4+ exhibits a monotonic relationship with both temperature and excitation wavelength within certain range, meaning its possible application in optical temperature sensing and wavelength detection....
3b, the bandgap reduction in Co:BiT is mainly due to the split-off density of states in the conduction band (indi- cated as red arrow), meaning that there will be charge-transfer excitations below the pure BiT gap. This is consistent with the addi- tional absorption peak in ellipsometry...