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We have investigated the optical properties (optical absorption, photoluminescence emission and excitation spectra, and luminescence kinetics) of a series of Eu-doped glasses with the compositions Li2B4O7, CaB4O7 and LiCaBO3. Li2B4O7:Eu, CaB4O7:Eu and LiCaBO3:Eu glasses of high chemical purity and optical quality have been obtained from the corresponding polycrystalline compounds in the air atmosphere, using a standard glass technology. The Eu impurity has been introduced into the borate compounds in the form of Eu2O3 oxide in the amounts of 0.5 and 1.0 mol. %. On the basis of electron paramagnetic resonance and optical spectroscopy data we have shown that the impurity is incorporated into the glass network exclusively as Eu (4f, F0) ions. We have identified all 4f–4f transitions of the Eu centres observed in the optical absorption and luminescence spectra. The most intense emission band of Eu peaked about at 611 nm (the D0  F2 transition) is characterized by a single exponential decay, with typical lifetimes that depend on the basic glass composition and the local structure of the luminescence centres Eu. The peculiarities of the electron and local structures of the Eu centres in the Li2B4O7, CaB4O7 and LiCaBO3 glasses have been discussed and compared with the reference data for Eu-doped borate single crystals and polycrystalline compounds with the similar chemical compositions, as well as with other borate glasses.

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium