Asymmetry effect on luminescence behaviors phospho-tellurite glass doped Eu3+: Judd-Ofelt analysis and EXAFS investigations

초록

This study systematically investigated the influence of soaking time on the structural, optical, and luminescence properties of Eu3+- doped phospho-tellurite glass. The results indicate that varying soaking times significantly alter the glass network, resulting in structural modifications that directly impact emission intensity. The highest emission intensity was observed at a soaking time of 1.5 h. This result also revealed that the trend in emission intensity is related to the Debye-Waller factor (sigma 2), which quantifies the disorder surrounding the Eu3+ ion, thereby confirming increased asymmetry around the Eu3+ ion. Other parameters, such as Omega 2 and the electric dipole/magnetic dipole (ED/MD) transition ratio, were also observed to follow a similar trend, consistent with the Judd-Ofelt theory. Furthermore, scintillation efficiency and Urbach's energy exhibited similar trends. While these parameters are not directly related to the asymmetry level around the Eu3+ ion, asymmetry is one contributing factor to their values. This finding can be used for designing glass fabrication to enhance emission efficiency for photonics material application.

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