Experimental and theoretical correlation of very intense visible green photoluminescence in BaZrO3 powders
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2008-03-15
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Cavalcante, L. S.
Longo, V. M.
Zampieri, M.
Espinosa, J. W. M.
Pizani, P. S.
Sambrano, J. R. [UNESP]
Varela, José Arana [UNESP]
Longo, Elson [UNESP]
Simoes, M. L.
Paskocimas, C. A.
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American Institute of Physics (AIP)
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Very intense visible green photoluminescence (PL) was observed at room temperature in structurally ordered-disordered BaZrO3 powders. Ab initio calculations, ultraviolet-visible absorption spectroscopy, electron paramagnetic resonance, and PL were performed. Theoretical and experimental results showed that local defects in the cubic structure caused by [ZrO5 center dot V-O(z)] complex clusters, where V-O(z) = V-O(x), V-O(center dot), and V-O(center dot center dot), play an important role in the formation of hole-electron pairs, giving rise to a charge gradient in the structure which is responsible for PL emission. (c) 2008 American Institute of Physics.
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Journal of Applied Physics. Melville: Amer Inst Physics, v. 103, n. 6, p. 8, 2008.