F-centre/Mn complex photoluminescence in the fluoroperovskites AMgF3:Mn (A = Na, K, or Rb)

Photoluminescence (PL) measurements were made on AMgF3:Mn (A = Na, K, or Rb) before and after X-ray irradiation. F-centre/Mn (F/Mn) complexes were seen in all samples after irradiation where the energy levels are perturbed from the original Mn2+ levels. The perturbed energy of each level depends on the total angular momentum and decreased for the Mn2+ 4G levels and increased for the 4D levels. KMgF3:Mn contains two F/Mn complexes where the second complex has a significantly smaller Mn2+ perturbation for low energies. The Mn2+ crystal field parameters have been calculated from the PL data and 10Dq is found to be smallest for the largest ionic radius, where A = Rb. Oxygen-related PL is observed in all compounds. Our measurements of the F/Mn complex energies will assist in computational and theoretical studies of these complexes, which is important given their potential application in radiation dosimetry. Keywords: Fluoroperovskite, Mn2+, Defect complex, Dosimetry, Crystal field

Abstract licence: CC BY-NC-ND

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