Otro
Strong violet-blue light photoluminescence emission at room temperature in SrZrO3: Joint experimental and theoretical study
Registro en:
Acta Materialia. Oxford: Pergamon-Elsevier B.V. Ltd, v. 56, n. 10, p. 2191-2202, 2008.
1359-6454
10.1016/j.actamat.2007.12.059
WOS:000256939800003
Autor
Longo, V. M.
Cavalcante, L. S.
Erlo, R.
Mastelaro, V. R.
de Figueiredo, A. T.
Sambrano, J. R.
de Lazaro, S.
Freitas, A. Z.
Gomes, L.
Vieira, N. D.
Varela, José Arana
Longo, Elson
Resumen
Ultrafine ordered and disordered SrZrO3 powders were prepared by the polymeric precursor method. The structural evolution from structural disorder to order was monitored by X-ray diffraction and X-ray absorption near-edge spectroscopy. Complex cluster vacancies [ZrO5 center dot V-O(Z)] and [SrOII center dot V-O(Z)] (where V-O(Z) = V-O(X), V-O(center dot) and V-O(center dot center dot)) were proposed for disordered powders. The intense violet-blue light photoluminescence emission measured at room temperature in the disordered powders was attributed to complex cluster vacancies. High-level quantum mechanical calculations within the density functional theory framework were used to interpret the experimental results. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.