Luminescence of Mn⁴⁺ in the orthorhombic perovskite, LaGaO₃

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• 作者：A.M. Srivastava^a ; ^{srivastava@ge.com} ; S.J. Camardello^a ; M.G. Brik^b ; ^c ; ^d
• 关键词：Mn4+ ; LaGaO3 ; Perovskite ; Crystal-field splitting ; Covalence ; Luminescence
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：437-441
• 全文大小：764 K
• 卷排序：183

文摘

The optical properties of Mn4+ (3d3) in the orthorhombic perovskite, LaGaO3 are investigated. The Mn4+ energy levels are calculated using the exchange charge model of crystal-field theory. The calculated Mn4+ energy levels are in good agreement with the experimental spectroscopic data. The results of our calculations yield the crystal-field splitting and Racah parameters of Dq=1926 cm−1, B=780 cm−1 and C=2878 cm−1, with C/B=3.7. The emission spectrum is assigned on the basis of the zero phonon line corresponding to the 2Eg→4A2g transition and its vibrational sidebands. A comparative study of the variation in the crystal-field splitting and the Mn4+ 2Eg energy level position in materials with the perovskite structure is also presented.