Fig. 4. Enhanced PT effect by quenching luminescence in Bi-doped germanate glass.
a Emission spectra of glass samples G5AxB, where the Bi2O3 content x changes from 0.05 to 10 mol%; b temperature (black line) and integrated emission intensity (blue line) of glass samples G5AxB; the red line in b demonstrates the double exponential fitting curve with a correlation coefficient of 99.5 %; the inset in b demonstrates the ratio of induced temperature increase (ΔT) to absorption coefficient at 808 nm (taken from Fig. 1) as a function of Bi2O3 concentration; c decay curves of G5AxB; d lifetime of G5AxB with emission at 1300 nm upon 808 nm; e excitation spectra (λem = 1300 nm) of G5AxB; f temperature curves of G5AxB as a function of irradiation time; power density of 808 nm LD was attenuated to 1 W cm−2; and g thermal images of G5AxB, as the sample temperature became saturated.