Al2O3 influence on structural, elastic, thermal properties of Yb3+ doped Ba–La-tellurite glass: Evidence of reduction in self-radiation trapping at 1 μm emission

• Increased glass network rigidity and thermal stability factor on Al2O3 inclusion.
• Estimation of Oscillator strength and radiative rate of Yb3+ ion transition.
• Increased Quantum efficiencies due to reduced non-radiative rates.
• Reduced radiation trapping of ∼1 μm emission with enhanced Yb3+ ion dispersion.

Ba–La-tellurite glasses doped with Yb3+ ions have been prepared through melt quenching technique by modifying their composition with the inclusion of varied concentration of Al2O3 to elucidate its effects on glass structural, elastic, thermal properties and Yb3+ ion NIR luminescence performance. The FTIR spectral analysis indicates Al2O3 addition is promoting the conversion of BOs from NBOs which have been generated during the process of depolymerisation of main glass forming TeO4 units. The elastic properties of the glass revealed an improved rigidity of the glass network on addition of Al2O3. In concurrence to this, differential thermal analysis showed an increase in glass transition temperature with improved thermal stability factor. Also, Yb3+ fluorescence dynamics demonstrated that, Al2O3 inclusion helps in restraining the detrimental radiation trapping of ∼1 μm emission.

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