Abstract
The absorption and excitation spectra of trivalent transition metal V 3+ ions doped in LiGaO 2 and LiAlO 2 oxide crystals are measured by Kuck and Jander [Opt. Mater. 13, 299 (1999)]. These spectra have provided evidence of the occurrence of transitions from the 3 A 2 ( 3 F) ground state to the crystal-field split levels 3 T 2 ( 3 F), 3 T 1 ( 3 F), and 3 T 1 ( 3 P) for V 3+ :LiGaO 2 . But only the transitions from the 3 A 2 ( 3 F) ground state to the crystal-field split levels 3 T 1 ( 3 F) and 3 T 1 ( 3 P) are observed for V 3+ :LiAlO 2 (levels are assigned to the T d symmetry, i.e. ideal tetrahedron (VO 4 ) 5- ). The splittings of each band of the T d symmetry is due to the distortion of the ideal tetrahedron. Using the experimentally determined data from the excitation spectra, a theoretical calculation for the crystal-field levels of V 3+ :LiGaO 2 and V 3+ :LiAlO 2 was performed by Kuck and Jander, based on the angular overlap model theory. The calculation reveals a good agreement between the mean values of the bands, while it underestimates the splitting of each band. A detailed crystal-field analysis of electronic energy levels of V 3+ doped in LiGaO 2 and LiAlO 2 oxide crystals based on the Racah theory is proposed in this work. The observed crystalline-field splitting of the V 3+ terms was accounted for using a C 2 symmetric Hamiltonian. In turn, reliable crystal-field and Racah parameters have been obtained. This theoretical analysis confirms the observed crystalline-field splittings of the 3 F and 3 P terms of the V 3+ ion doped in the two oxide crystals LiGaO 2 and LiAlO 2 . The crystalline-field splittings of the 3 T 2 ( 3 F) level for LiAlO 2 are deduced.
Published Version
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