Abstract
X-ray luminescence spectra of Li2B4O7:Er glasses have been investigated in the range of 200–800 nm. It is shown that all identified peaks in the dependence IXRL = f(λ) are due to parity-forbidden intra-configuration radiative transitions within the 4f configuration of Er3+ ion from excited fine-structure levels of higher lying multiplets to the ground-term level 4I15/2.
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