Investigation of the aluminum oxide content on structural and optical properties of germanium glasses doped with RE ions.

In this paper structural and optical properties of Rare Earth doped (RE) gallo-germanate glasses modified with various amount of Al ₂ O ₃ have been investigated. Glasses doped with Yb ³⁺ , Tm ^3+, and Ho ³⁺ ions were synthesized to study Al ₂ O ₃ additive influence on their structural and emission properties in the visible spectral region. MIR spectra indicated that the structure of prepared glasses tends to order and its polymerization along with the aluminum content increase. Glass samples consisting of the low molar content of Al ₂ O ₃ are characterized by a significant contribution of Tm ³⁺ ions in light emission while Ho ³⁺ ions luminescence dominates in samples consisting of the higher molar content of Al ₂ O ₃ . Additionally, investigation of light emission in visible range showed that samples consisting of the low molar content of Al ₂ O ₃ are characterized by greenish blue light emission whereas light emitted by samples consisting of 15-20 mol% is much closer to the white colour.
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