Compositional dependence of Judd-Ofelt parameters ofEr3+ions in alkali-metal borate glasses
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Abstract
The Judd-Ofelt intensity parameters, ${\mathrm{\ensuremath{\Omega}}}_{\mathit{t}}$ (t=2,4,6) for f-f transitions of ${\mathrm{Er}}^{3+}$ ions doped in ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$-${\mathit{R}}_{2}$O (R=Na,K) glasses were determined from optical-absorption measurements, and their compositional dependence was investigated systematically. The values of ${\mathrm{\ensuremath{\Omega}}}_{2}$ exhibited a maximum around 25 mol % ${\mathit{R}}_{2}$O, while those of ${\mathrm{\ensuremath{\Omega}}}_{4}$ and ${\mathrm{\ensuremath{\Omega}}}_{6}$ decreased monotonically with an increase in ${\mathit{R}}_{2}$O content. The compositional dependences of ${\mathrm{\ensuremath{\Omega}}}_{4,6}$ were consistent with those of the isomer shift in $^{151}\mathrm{Eu}$ M\"ossbauer spectroscopy, which gives information about the 6s-electron density of ${\mathrm{Eu}}^{3+}$ ions. The variation of ${\mathrm{\ensuremath{\Omega}}}_{2}$ against ${\mathit{R}}_{2}$O content was related to the change in asymmetry of the rare-earth ligand due to the structural mixing of borate groups, while those of ${\mathrm{\ensuremath{\Omega}}}_{4,6}$ were related to the local basicity of rare-earth sites in the glass.
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