Photoluminescence of nanostructured PbTiO3 processed by high-energy mechanical milling
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Data
2001-04-09
Autores
Leite, E. R.
Santos, LPS
Carreno, NLV
Longo, Elson [UNESP]
Paskocimas, C. A.
Varela, José Arana [UNESP]
Lanciotti, F.
Campos, CEM
Pizani, P. S.
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American Institute of Physics (AIP)
Resumo
This letter reports on a process to prepare nanostructured PbTiO3 (PT) at room temperature with photoluminescence (PL) emission in the visible range. This process is based on the high-energy mechanical milling of ultrafine PbTiO3 powder. The results suggest that high-energy mechanical milling modifies the particle's structure, resulting in localized states in an interfacial region between the crystalline PT and the amorphous PT. These localized states are believed to be responsible for the PL obtained with short milling times. When long milling times are employed, the amorphous phase that is formed causes PL behavior. An alternative method to process nanostructured wide-band-gap semiconductors with active optical properties such as PL is described in this letter. (C) 2001 American Institute of Physics.
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Applied Physics Letters. Melville: Amer Inst Physics, v. 78, n. 15, p. 2148-2150, 2001.