Luminescence of LiBaF3 and KMgF3 doped with Eu2+

Abstract In this contribution the results of the high pressure spectroscopy of LiBaF 3 and KMgF 3 doped with Eu 2+ , where high pressure was applied in a diamond anvil cell are summarized. Photoluminescence, time resolved luminescence and luminescence kinetics, at a pressure from ambient to 300 kbar, at 77 K and ambient temperature are shown and discussed. The LiBaF 3 :Eu 2+ luminescence spectra consisted of sharp lines peaked at 27,500–28,000 cm − 1 attributed to the 6 P 7/ 2 → 8 S 7/2 transitions in the 4f 7 electronic configuration of Eu 2+ and a broad band extended between and 21,000 and 26,600 cm − 1 , attributed to Eu 2+ trapped exciton recombination. When the pressure increased the Eu 2+ trapped exciton emission disappeared and was replaced by a sharper band peaked at 28,200 cm − 1 attributed to 4f 6 5d 1 (e g ) → 4f 7 ( 8 S 7/2 ) transition in Eu 2+ . The KMgF 3 :Eu 2+ luminescence contained only the sharp lines related to the 6 P 7/ 2 → 8 S 7/2 transition of Eu 2+ and was found to be pressure independent, up to 300 kbar. The differences in the emission spectra between LiBaF 3 :Eu 2+ and KMgF 3 :Eu 2+ are discussed in the context of the structure of Eu 2+ sites in perovskite and inversed perovskite lattices.