Cooperative upconversion luminescence of Er3 + in Gd2O3 − xSx phosphor

FIG. Upconversion intensity variations with excitation power for Gd2O2S:Er phosphor at 549 nm and 671 nm with different sulfur content and photoluminescence upconversion decay curves measured at 671 nm (black) and the IRF (red) with 978 nm DPSS laser excitation at 1 W power.94