Síntese e estudo das propriedades ópticas de vidros de chumbo borossilicatos dopados com íons de itérbio em função da concentração e temperatura

Abstract

Rare Earths elements are objects of study in different areas of science because of their spectroscopic and magnetic properties with potential application in the construction of various electro-optical devices. In this work, it will be synthesized by the fusion method lead borosilicate glasses doped with Ytterbium ions in the state +3. Ion Ytterbium was chosen to dope the glass matrix as compared with other land-rare, this has the scheme more simplified energy levels, with only two energy states, which makes this very attractive ion for manufacturing optical devices high efficiency. The glasses will be melted by varying the concentration of oxides in order to find an optimal melting temperature. These matrices will be doped with ytterbium oxide and subsequently annealed with temperatures informed by analysis of differential scanning calorimetry, near the glass transition temperatures and crystallization temperature. Ion Ytterbium was chosen to dope the glass matrix as compared with other Rare Earth, this has the scheme more simplified energy levels, with only two energy states, which makes this very attractive ion for manufacturing optical devices high efficiency. The optical properties of the ion Ytterbium (Yb3+) doped in a glassy matrix of lead borosilicates, were analyzed by the optical absorption and photoluminescence techniques, which revealed a peak at 975 nm relative to the transition of 2F7/2 levels and more energy is 2F5/2, the most stable level of Yb3+. As the concentration rises from the ion intensity of the absorption and emission peaks intensified, confirming doping. The heat treatment at 470 °C for 3 hours was effective in initiating crystallization matrix, identified by infrared and absorption techniques. The lifetime is reduced with increasing concentration of Yb3+ ions due to a mechanism identified by the Stokowsk ratio.