Abstract
The Mn4+ and Cr3+-activated phosphor properties are examined in detail from an aspect of spectroscopic point of view. The phosphor materials discussed here are fluorides and oxides. Such Mn4+ and Cr3+-activated fluoride and oxide phosphors are classified from a different kind of host materials together with the different spectroscopic properties of photoluminescence (PL) and PL excitation (PLE) spectra into five groups: types F-Mn (F = fluoride), F-Cr, O-Mn (O = oxide), O-Cr-A, and O-Cr-B. The spectroscopic properties of the Mn4+ and Cr3+-activated phosphors are examined by analyzing PL and PLE spectra based on the Franck−Condon analysis model. The results show that an energy inequality relation of the zero-phonon line (ZPL) energies for types F-Mn, O-Mn, and O-Cr-A phosphors is given by E(2Eg)ZPL < E(4T2g)ZPL, whereas that for types F-Cr and O-Cr-B phosphors is given by E(2Eg)ZPL ≥ E(4T2g)ZPL. As a result, the former phosphors promise to emit light caused by the 2Eg → 4A2g transitions and the latter ones by the 4T2g → 4A2g transitions. Difference in the temperature-dependent PL intensity between the Mn4+ and Cr3+ red and deep red emissions are also discussed in detail.
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