Optical spectroscopy of the Er-doped glasses with 3CaO–Ga2O3–3GeO2 composition

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

“…Thus, the emission and luminescence excitation spectra also testify that the europium impurity is incorporated in the Li 2 ions. This agrees well with the data known for the Eu-doped lithium tetraborate crystal [22], the lithium tetraborate glass [31], the lithium borate glasses [20,23,43] and the other borate glasses [24,44,45]. However, the above result does not correlate with the findings for the Eu-doped Li 2 B 4 O 7 [31] and SrB 4 O 7 [29] crystals, the lithium borate glasses [21] and some other borate glasses [28,30].…”

“…reveal high luminescence efficiencies in various host materials and the emission in a broad enough spectral range. They are widely used as activator centres in different laser, luminescent and scintillate materials [18,19], including Eu-doped borate crystals and glasses such as Li 2 B 4 O 7 [13,14,[20][21][22][23], SrB 4 O 7 [24,25] and some others [26,27]. One can also notice that crystalline and glassy (or vitreous) oxide compounds are efficient luminescent materials for the 'orange-red' and 'violetblue' spectral regions, when being activated with Eu 3+ and Eu 2+ ions, respectively.…”

“…Up to now the optical and luminescent properties of crystalline and glassy Eu-doped borate compounds with different chemical compositions have been extensively investigated in a number of works [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Let us remind of the main results.…”

Raman Spectra of Glasses of CaO-Ga2O3-GeO2 System

“…The basic chemical composition of our samples was controlled by X-ray microanalysis method, using a "Camebax" apparatus. For investigation of Raman spectra we selected a number of typical glass samples with the basic compositions of garnet (Ca 3 × × . Samples of the garnet crystals were oriented with respect to specific crystallographic planes, in order to obtain a controlled light-scattering geometry.…”

“…In the recent works [1][2][3][4][5][6] it has been shown that the glasses of CaO-Ga 2 O 3 -GeO 2 system activated with Cr 3+ , Nd 3+ , Er 3+ and Ho 3+ ions are promising materials for active elements of solid-state lasers. Spectroscopic properties of activator ions in the host materials strongly depend on electron-phonon interaction.…”