Crystal-Field Analysis of the Ce3+ Spectrum in YAlO3 Single Crystals

Abstract

Infrared and ultraviolet absorption spectra arising from f ! f and f ! d transitions of Ce 3+ in YAlO 3 crystals are studied by Weber and used to derive the 4f and 5d energy levels. Excitation and fluorescence spectra of 5d ! 4f emission are also studied by Weber. From these spectra, the energy-level values for the 5d and 2 F 7/2 multiplets are deduced, whereas the positions of the energy levels for the 2 F 5/2 multiplet given by Weber are uncertain. A detailed crystal-field analysis of electronic energy levels of Ce 3+ doped in YAlO 3 crystals is proposed in this work. The observed crystalline-field splittings of the Ce 3+ multiplets were accounted for using a C 1h symmetric Hamiltonian. In turn, reliable crystal-field parameters have been obtained. This theoretical analysis confirms the observed crystalline-field splittings of the 5d and 2 F 7/2 multiplets. The crystalline-field splittings of the 2 F 5/2 multiplet are deduced.

Crystal-field splitting of the Cr4+ terms in LiAlO2 oxide crystal

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Calculations of physical properties of pure and doped crystals: Ab initio and semi-empirical methods in application to YAlO3:Ce3+ and TiO2

“…The orbitally degenerated t 2g and e g states are split by a lowsymmetry component of the crystal field, which was also emphasized in Ref. [24].…”

Luminescence properties of Dy3+:GdAlO3 nanopowder phosphors

“…The former case occurs for Dy 3+ :-GAP nanophosphors, and this can be explained according to the crystal structure of GdAlO 3 . The Pbnm symmetry model of GdAlO 3 contains two cationic sites: (i) AlO 6 octahedra site with inversion center, and (ii) GdO 12 polyhedra site without inversion center with Cs point symmetry [17,18]. The spectral property of the Dy 3+ confirms that the Dy 3+ ions occupy the polyhedra of Gd 3+ sites in the GdAlO 3 host lattice.…”