Abstract
The Cr3+-activated phosphor properties are discussed in detail from an aspect of spectroscopic point of view. The phosphor materials considered here are fluoride and oxide hosts. Such Cr3+-activated fluoride and oxide phosphors are classified from a different kind of spectroscopic properties of photoluminescence (PL) and PL excitation spectra. A method is proposed for obtaining reliable crystal-field (Dq) and Racah parameters (B and C) using a ligand field theory with paying an attention to difficulty in the exact estimation of such important crystal-field-related phosphor parameters. The intra-d-shell Cr3+ states, such as 2Eg, 4T2g, and 4T1g, in some fluoride and oxide hosts are obtained and plotted against Dq in the Tanabe−Sugano energy-level diagram. The results are found to be in good agreement with each other.
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