Spectroscopy of Mn4+ in orthorhombic perovskite, LaInO3

Abstract The low temperature spectroscopic properties of Mn 4+ (3d 3 ) in the orthorhombic perovskite, LaInO 3 , is examined in this work. The exchange charge model of crystal-field theory is used to calculate the Mn 4+ energy levels. The spectra can be fitted by the parameters D q  = 1776 cm −1 , B  = 700 cm −1 and C  = 3189 cm −1 , with C / B  = 4.5. Discussions pertaining to the low luminescence efficiency of LaInO 3 :Mn 4+ are presented. A comparative study of the variations in the energy of the 2 E g → 4 A 2g emission transition in a series of materials with the perovskite structure is presented. The data suggest a relationship between the energy of the 2 E g → 4 A 2g emission transition and the deviation of the octahedral O-Mn-O bond angle from the ideal 90°. It is concluded that the angular distortion is not large enough to support the development of high luminosity Mn 4+ activated phosphors in the ABO 3 perovskite family of materials.