3 years ago

Mn4+ and Cr3+ ions in red and deep red-emitting phosphors: Spectral analysis and Racah parameter determination

Sadao Adachi

The luminescence properties of the Mn4+ and Cr3+-activated fluoride and oxide phosphors have been discussed in detail. The Mn4+ and Cr3+-activated fluoride and oxide phosphors can be classified into five types from an aspect of the different luminescence properties: F–Mn, F–Cr, O–Mn, O–Cr-A, and O–Cr–B. The representative phosphors considered here are: BaSiF6:Mn4+ (type F–Mn), K2NaScF6:Cr3+ (type F–Cr), Sr2MgGe2O7:Mn4+ (type O–Mn), MgAl2O4:Cr3+ (type O–Cr-A), and BaZrSi3O9:Cr3+ (type O–Cr–B). The photoluminescence (PL) and PL excitation spectra are analyzed based on the Franck−Condon analysis model with considering the electron−lattice vibration interaction (Huang−Rhys factors). The Racah and crystal-field-related parameters of such phosphors are determined and plotted very well on the Tanabe−Sugano energy-level diagram curve.

Publisher URL: https://www.sciencedirect.com/science/article/pii/S0022231319324743

DOI: 10.1016/j.jlumin.2020.117217

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