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Electronic structure of Ce3+ multicenters in yttrium aluminum garnets
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Image of FIG. 1.
FIG. 1.

Transmission spectrum of the bulk YAG:Ce (3%) sample taken at 13 K in the region of Ce transitions. Transitions designations are marked on the graph.

Image of FIG. 2.
FIG. 2.

Absorption spectra of Ce-doped YAG crystal and epitaxial layer at room temperature in the region of intra-configurational transitions.

Image of FIG. 3.
FIG. 3.

Transmission spectrum of the YAG:Ce epitaxial layer sample taken at 11 K in the region of Ce transitions. Large noise-like signal between 2800 and 3600 cm is associated with the very low reference signal in this spectral region.

Image of FIG. 4.
FIG. 4.

Absorption spectra of YAG:Ce crystal and epitaxial layer at 15 K. Insets show expanded spectra around the 0-phonon lines.


Generic image for table
Table I.

Calculated and measured 4f and 5d CF energy levels of Ce ions doped in YAG (data given in cm). All CF energy states have the same representations in D symmetry. The symbol “I.R.” stands for the double-value irreducible representation of the parent group of D (i.e., D point-group). and correspond to the calculated and observed CF energy level values, respectively. The value in the bracket stands for the maximum of the measured 4f-5d absorption band. The maximums of the last two high-energy 4f-5d absorption bands were obtained by the Gaussian-shape decomposition.

Generic image for table
Table II.

The energy parameters of Ce ions doped in YAG in the framework of ECM (unit: all in cm except the two and parameters). Details are given in Ref. . The abbreviations “,” “,” and “” stand for the CFP contributions from point charges, exchange charges, and the correction due to other factors, such as dipoles, respectively, and then “total” represents their sum.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electronic structure of Ce3+ multicenters in yttrium aluminum garnets