Vidro de Chumbo-Fosfato Pb3(PO4)2 com altas dopagens de Neodímio

Abstract

In this work, the structural and optical properties of vitreous lead phosphate system were investigated Pb3(PO4)2 with high concentrations of Nd3+. These glasses were produced by melting/cooling method. The synthesis conditions such as the melting temperature of the components have been optimized in order to obtain good optical quality and chemical resistance for subsequent preparation of optical fibers, optical integrated circuits and other devices. Measures for the X-ray difiraction revealed amorphous structures across the track. The optical window determined by absorption spectroscopy is between 300 and 2750 nm. The analysis based on Judd-Ofelt theory were made based on the absorption spectra of the individual bands. The determination of the phenomenological parameters and allows the spectroscopic determination of relevant parameters such as radiative lifetime, quantum eficiency and luminescence branching ratio, showed little change in the crystalline structure of the glass network. However, it was observed changes was observed in the distribution of electron density in the rare earth ions to highest concentrations of these dopants. The Raman spectroscopy showed spectral shifts between regions 900-1100 cm -1 and 1150-1400 cm-1 suggesting changes in phosphate network connections (PO4)3- e (PO2)as, respectively. Spectroscopy measurements Fourier transform in the region 500- 4000 cm -1 showed an increase in content OH- with increasing concentration of Nd3+. This result was attributed to increased hygroscopic sample because it is in opposition to the results of analyzes of the Urbach energy that indicated reduction in clutter density of localized states. The measures relating to the lifetime in the arrays without treatment and with heat treatment showed no change in the structure. By comparing the experimental and radiative lifetimes was observed a change abrupt between these two parameters may be related to a possible level changes in the matrix. The results obtained in this study contribute to research on materials that may be used as active means for solid-state lasers in the near infrared region, pumped by high-power diode lasers available on the market at low cost.