Abstract

Theoretical description of the charge-transfer state arising in Y 2O 3–Yb crystal after excitation is proposed on the basis of ab initio embedded cluster calculations. The best agreement with experimental data was obtained for a hole localized on a 2p orbitals of one of the oxygen ions surrounding the Yb 3+ ion. Parameters of the charge-transfer luminescence such as Stokes shift, maxima of the absorption and emission bands and radiative lifetime obtained from the ab initio calculations are in fair agreement with the experimental data.

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