EPR and photoluminescence of Cr3+ions in CsCdF3and CsCaF3

Abstract

EPR and photoluminescence measurements of chromium doped CsCdF 3 and CsCaF 3 crystals have been performed. The two main EPR signals are associated with cubic and trigonal Cr 3+ centers. The g factor, the parameters of the hyperfine (HF) interaction with the 53 Cr nuclei and the superhyperfine (SHF) interaction with the six nearest neighbour fluorine nuclei have been derived for the cubic centers. For the trigonal ones the g factor and the zero field splitting parameter have been obtained. Photoluminescence and lifetimes have been measured at 10 K. The observed phonon structure is associated with zero phonon lines (ZPL) and vibrational replicas of both cubic and trigonal centers. The frequencies of the phonon modes of the [CrF 6 ] 3- complex involved in the structure have been derived.