Influence of Yb3+ and Er3+ ions environment on the evolution of its' luminescent properties in oxide glasses under ionizing irradiation

Abstract : We have investigated the effects of ionizing irradiation (e¯- and γ-) on the Yb3+ and Er3+ luminescent properties in aluminosilicate (AS) and phosphate glasses by trying to understand the impact of initial Yb3+ environment and mostly the role of Yb cluster. For that, AS and phosphate glasses containing different amount of Yb clusters were irradiated in 104-2∙109 Gy dose range. At first, we have shown that the point defect fading is slow down by a clustering effect in the glass. We have obtained a 2-step dependence of point defects quantity versus lg(dose). The cluster presence limits the defect production in the high dose range, whatever the glass composition (AS or phosphate). Consequently, we observed the same two-regions trends for the 2F5/2 lifetime as a function of the lg(dose). But for high content of cluster, the lifetimes value decreases linearly within lg(dose). This result does not depend on the glass type nor on the rare earth element (Er3+), implying a more general mechanism that implying one type of defect in particular. Secondly, we have interpreted the strong variation of the complex EPR signal in phosphate glasses within glass composition, dose and time with the formation of at least 8 point defects. In addition, the origin of the luminescent diamagnetic defect is discussed.
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Submitted on : Thursday, January 30, 2014 - 2:28:54 PM
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V. Pukhkaya. Influence of Yb3+ and Er3+ ions environment on the evolution of its' luminescent properties in oxide glasses under ionizing irradiation. Materials Science [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2013. English. ⟨pastel-00939232⟩

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