X-ray luminescence spectra of Li 2 B 4 O 7 :Er glasses have been investigated in the range of 200-800 nm. It is shown that all identified peaks in the dependence І XRL = f(λ) are due to parity-forbidden intraconfiguration radiative transitions within the 4f configuration of Er 3+ ion from excited fine-structure levels of higher lying multiplets to the ground-term level 4 I 15/2 .
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