1. Locations of the energy levels of lanthanide ions in Gd2O3 single crystals.
- Author
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Pustovarov, V.A., Ogorodnikov, I.N., Nikolaev, R.E., Tarasenko, M.S., Tavrunov, D.A., Trifonov, V.A., and Naumov, N.G.
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SINGLE crystals , *TERBIUM , *RARE earth metals , *GROUND state energy , *RADIATIVE transitions , *IONS , *ABSORPTION spectra - Abstract
Large-sized, high optical quality Gd 2 O 3 single crystals were grown from a solution at T = 1145 °C using Czochralski method. XRD analysis showed that the crystal structure is characterized by a single cubic (bixbyite) phase (c -phase). The absorption spectra and luminescence properties of Gd 2 O 3 doped with Eu3+ and Tb3+ impurity ions were studied. The absorption spectrum of Gd 2 O 3 :Eu in the short wavelength region is mainly due to charge transfer transitions from O2− to Eu3+ (240–290 nm), which overlap with the Urbach tail of the host-absorption. Additionally, electronic transitions in Eu3+ (320–540 nm) and Gd3+ (245–315 nm) lanthanide ions contribute to the absorption spectrum. Intraconfigurational radiative f – f transitions in impurity ions are clearly observed upon both UV- and X-ray excitations. However, 6 P J → 8 S 7 / 2 radiative transitions in Gd3+ ions are completely unobservable. Based on the obtained spectroscopic data, the energy positions of the ground state of all di- and trivalent lanthanide ions, as well as the energies of intraconfigurational f – f and interconfigurational f – d electronic transitions in Gd 2 O 3 crystals with a cubic structure, are calculated. The proposed electronic energy diagram is used to discuss efficient energy transfer between lanthanide ions. [Display omitted] • We grew optical quality Gd 2 O 3 single crystals from flux using Czochralski method. • XRD analysis of the Gd 2 O 3 crystals showed monophase cubic structure. • We studied intraconfigurational f – f transitions upon UV and X-ray excitations. • We determined the lowest energy levels of Ln2+ and Ln3+ ions in Gd 2 O 3 crystals. • We revealed efficient energy transfer between lanthanide ions in Gd 2 O 3 crystals. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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