Optical properties of Eu3+ions in lead tungstate tellurite glasses

Lead tungstate tellurite (LTT) glasses doped with different concentrations of Eu3+ ions have been prepared by the conventional melt quenching method. From the absorption spectrum, it has been observed that the bands originated both from the ground (7F0) and the first excited (7F1) states. Judd-Ofelt intensity parameters Ω2 and Ω4 have been evaluated from the 5D0 → 7F2 and 5D0 → 7F4 emission transitions respectively. The evaluated J-O intensity parameters have been used to calculate different radiative and laser characteristic parameters of the 5D0 excited level. The large magnitudes of stimulated emission cross-section (σe) and branching ratio (βR) obtained for 5D0 → 7F2 (0.62 μm) transition suggests that the LTTEu20 glass could be more suitable for lasing action in the visible region. The measured lifetime of 5D0 excited state increases with increase of Eu3+ concentration due to increasing asymmetry around the Eu3+ ions.

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