Abstract
The electronic energy states in the Mn4+-activated phosphors are examined based on the Tanabe−Sugano energy-level diagram. Investigation is focused on the determination of the Racah and crystal-field parameters. The previous review [ECS J. Solid State Sci. Technol., 9, 016001 (2020)] suggested that some excited energy states 2Eg and 4T2g of Mn4+ ion can be relatively accurately determined from photoluminescence (PL) and PL excitation spectra with performing the Franck−Condon principle analysis based on the configurational-coordinate model. However, it is very difficult to accurately determine the higher-lying 4T1g,a energy from any optical spectrum. This higher-lying energy state needs in the calculation of the Racah parameters. Therefore, a set of expressions is proposed for an accurate determination of the Racah and also crystal-field-related parameters only by introducing 2Eg and 4T2g values. Results are in good agreement with the Tanabe−Sugano energy-level diagram for the Mn4+-activated phosphors of various host materials like fluorides, oxides, and oxyfluorides.
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