Optical spectra, energy levels, and crystal-field analysis of tripositive rare-earth ions in Y2O3. IV. C3i sites

Abstract

We report an analysis of new and previously existing optical absorption and fluorescence data, far-infrared data, and electronic Raman scattering data for Eu3+, Dy3+, and Er3+ in the C3i sites of Y2O3 and R2O3, where R=a rare earth. Our previous analysis of C2-site spectra yields an effective point-charge model for the host lattice that allows initial estimates to be calculated for the C3i-site crystal-field parameters Bkm. Best-fit values of B20, B40, and B43 are obtained for Eu, and best-fit values of all Bkm allowed by symmetry are obtained for Dy and Er. The best-fit Bkm are in relatively poor agreement with the model; in particular, B20 has the opposite sign from and B44 is much smaller than the model predictions. From the best-fit Bkm we obtain phenomenological crystal-field components Akm, from which we predict Bkm and C3i -site energy levels for the ground states of Tb3+, Ho3+, Tm3+, and Yb3+. While the effective point-charge model is apparently too crude to make accurate, quantitative, a priori predictions, the model and the data allow one to predict confidently the behavior of ions doped into C3i sites for which no data exist.

Crystal field analysis of erbium doped yttrium oxide thin films in C2 and C3i sites

“…Using the calculated energy level of Er 3+ ions in C 3i sites represented in Table 7, we have assigned the emissions labeled 4), 5) and 6) ( Table 6). The observed levels of 4 I 13/2 manifold reported here are in agreement with those reported by Gruber et al [5] for Er 3+ ions in Y 2 O 3 single crystal with some reassignments.…”

“…The values of the independent crystal-field parameters obtained are listed in Table 8. The B kq values are in good agreement with those reported by Gruber et al [5] for Erbium doped Y 2 O 3 single crystal.…”

“…[5]. Levels belonging to the 4 I 13/2 manifold of Er 3+ in C 3i sites are assigned on the basis of our work.…”

“…Rare-earth doped Y 2 O 3 has received considerable attention over the years since the oxide lattice is a firstrate laser host material [1][2][3][4][5]. Particularly numerous studies have been carried out on the 4f 11 ion Er 3+ , which exhibits the standard telecommunication wavelength emission at 1.54 µm.…”

The Eu(III) Ion as Luminescent Probe: Investigation of the Metal‐Ion Sites in a Dicyclohexyl‐18‐crown‐6 Complex

“…-Luminescent lanthanide ions are being extensively used to solve analytical [2] [3] and structural [4] problems. They are especially useful in probing local structures in crystals [5], glasses [6], and solutions [7]. In particular, the Eu(II1) ion displays an intense luminescence from a long-lived excited state, 'Do which, along with its ground-state 'F,, is not split by ligand-field effects.…”