High pressure luminescence study of Sm³⁺: K–Ba–Al fluorophosphate glass

The luminescence spectra and decay curves for the 4G5/2 level of Sm3+ ions in 55.95P2O5+14K2O+6KF+14.95BaO+9Al2O3+0.1Sm2O3 glass, referred to as PKFBASm01, have been studied as a function of pressure up to 40.5 GPa at room temperature. With the increase in pressure, a continuous red shift of the 4G5/2→6H9/2, 7/2, 5/2 transitions and a progressive increase in the magnitude of the crystal-field splittings for these transitions are observed. The decay curves for the 4G5/2 level of the Sm3+ ions in PKFBASm01 glass are found to exhibit single exponential behavior at ambient pressure and become non-exponential at higher pressures, accompanied by shortening of lifetimes. A generalized Yokoto–Tanimoto model has been used to explain the pressure-induced non-exponential nature of the decay curves.