Navegando por Autor "Figueiredo, A. T. de"
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Artigo Highly intense violet-blue light emission at room temperature in structurally disordered SrZrO3 powders(American Institute of Physics, 2007-02-27) Longo, V. M.; Cavalcante, L. S.; Figueiredo, A. T. de; Santos, L. P. S.; Silva, Elson Longo da; Varela, José A.; Sambrano, Julio Ricardo; Paskocimas, Carlos Alberto; Vicente, F. S. de; Hernandes, C.Violet-blue photoluminescence was produced at room temperature in a structurally disordered SrZrO3 perovskite structure with a 350.7 nm excitation line. The intensity of this emission was higher than that of any other perovskites previously studied. The authors discuss the role of structural order-disorder that favors the self-trapping of electrons and charge transference, as well as a model to elucidate the mechanism that triggers photoluminescence. In this model the wide band model, the most important events occur before excitation