High pressure effect on optical properties of cerium ion in fluoroaluminate glass

High pressure effects on optical properties of Ce³⁺ doped ternary fluoroaluminate (18BaF₂·37CaF₂·45AlF₃) glass have been investigated in terms of ligand field around cerium ion. Five bands due to the 4f-5d transitions were observed in ultraviolet absorption spectra for the glass. A photoluminescence band was observed at around 300 nm under excitation at each band. The photoluminescence band shifted toward smaller energies by densifying the glass using high pressures and temperatures. An energy shift of the band was also found in in situ photoluminescence measurement under high pressure using a sapphire anvil cell. However, the shift observed under high pressure was large compared with that of the densified glass. We deduced that the large peak shift under high pressure is mainly due to a local elastic contraction around cerium ion.