New Analysis Model for the Determination of Racah and Crystal-Field Splitting Parameters: Verification and Case Studies

被引:69
作者
Adachi, Sadao [1 ]
机构
[1] Gunma Univ, Div Elect & Informat, Fac Sci & Technol, Kiryu, Gunma 3768515, Japan
关键词
Luminescence; -; Spectroscopy; Theory; Phosphors; Characterization; PHOTOLUMINESCENCE PROPERTIES; OPTICAL-PROPERTIES; SPECTRA; MN4+; CR3+; PHOSPHORS; LUMINESCENCE; OXIDES; IONS;
D O I
10.1149/2162-8777/ab8879
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The Racah parameters in conjunction with the Tanabe-Sugano energy-level diagram are widely used as a means of describing the effects of electron-electron repulsion within the metal complexes in coordination chemistry. A determination of the excitation energy levels in the 3d(3)-configuration ions (Mn4+, Cr3+, etc.) is possible from a set of Racah parameters (B and C) and crystal-field splitting parameter (Dq), and vice versa. The Tanabe-Sugano diagram promises that the zero-phonon line E-2(g) energies, E(E-2(g))(ZPL), over B of the Mn4+ and Cr3+ ions should be nearly crystal field independent, since they are practically parallel to the horizontal axis in the whole range of Dq/B variation. However, the experimental E(E-2(g))(ZPL) plots showed a gradual increase with increasing Dq/B, in disagreement with the Tanabe-Sugano diagram. Therefore, a new analysis model assuming the Racah parameter ratio of C/B similar to 4.7 has been recently proposed [ECS J. Solid State Sci. Technol., 8, R164 (2019); 8, R183 (2019)]. However, the new model has been used without rigorous validation. The present study focused on this problem and analyzed the luminescence properties of LiBaF3:Cr3+ and LaGaO3:Mn4+ phosphors. More generalized expressions were proposed for analyzing the various kinds of phosphors at an optional ratio of C/B = r. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
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