The optical properties of Mn 4+ (3d 3 ) in the double perovskites, La 2 LiSbO 6 and La 2 MgTiO 6 , are investigated. The Mn 4+ energy levels are calculated using the exchange charge model of crystal-field theory and compared with the experimental spectroscopic data. A comparative study of the optical properties of Mn 4+ in the perovskite structure shows that energy of the 2 E g → 4 A 2g emission transition is determined by octahedral site distortion. The greater is the site distortion, the lower is the Mn-O covalent interaction and the higher is the energy of the 2 E g → 4 A 2g emission transition. The work provides guidelines for the development of deep red emitting phosphors for agricultural (horticultural) applications.
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Srivastava et al. (2017) studied this question.
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