Efeitos fotoinduzidos em vidros e filmes de fosfato de antimônio dopado com chumbo e fosfato de antimônio dopado com cromo / Photoinduced effects in glasses and films of lead doped antimony phosphate and chromium doped antimony phosphate

AUTOR(ES)

Sandra Tessutti Dias

DATA DE PUBLICAÇÃO

2010

RESUMO

The present work is about the study of the optical and structure properties of doped antimony phosphate glasses and thin films. The glasses were produced by the melting of precursors [Sb(PO3)3]n + Sb2O3 using PbO and Cr2O3 as dopant at 900 °C in vitreous carbon crucibles, then poured and quickly cooled into steel molds. The vitreous composition are: 20% [Sb(PO3)3]n 77% Sb2O3 3%PbO, 20 %[Sb(PO3)3]n 77% Sb2O3 3%Cr2O3 e 20 %[Sb(PO3)3]n 74% Sb2O3 6%Cr2O3 (mol%). The samples characterization started with EDX measurements for compositional micro-analysis. Then for the glasses in bulks form the absorption and luminescence spectra were measured. The luminescence measurements were done using MLUV (350 nm) and MLVI (415 nm) of a Kr+ laser. EPR measurements were taken for the Cr doped glasses because they present unpaired electrons. The thin films were deposited on soda lime substrates by the electron beam evaporation technique. From absorption spectra, the bandgap value around 3 eV was evaluated, noting that the best irradiation source of the samples was using a MLUV of a Kr+ laser. Only [Sb(PO3)3]n: 3% Pb2+ films presented photostructural effects. Therefore a systematic study varying several parameters, like irradiation time, power density and film thickness was conducted to observe the effect optimization. Following the photostructural variation, occurred photocchromic effects, in this case, photobleaching effects, which were characterized by a displacement of absorption edge to lower energies, observed in the absorption spectra of the irradiated areas. With the observed results from the study and characterization of the samples, some technologies applications were discussed, like in the case of the observed films effects that can be used for recording diffraction gratings.

ASSUNTO(S)

luminescence vidros fosfato de antimônio antimony phosphate glasses luminescência fotoclareamento photoexpansion fotoexpansão thin films filmes finos photobleaching

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