Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10201
Title: Blue-shift and intensity enhancement of photoluminescence in lead-zirconate-titanate-doped silica nanocomposites
Authors: Lu, SG
Mak, CL 
Pang, GKH
Wong, KH
Cheah, KW
Issue Date: 2008
Publisher: IOP Publishing Ltd
Source: Nanotechnology, 2008, v. 19, no. 3, 35702 How to cite?
Journal: Nanotechnology 
Abstract: Transparent PbZr 0.52Ti 0.48O 3 (PZT)-doped silica nanocomposites were fabricated via a modified sol-gel process. The nanocomposites were annealed at different temperatures between 740 and 800°C in order to produce PZT crystallites with different particle sizes. X-ray diffraction analysis indicated that the embedded PZT nanoparticles were crystallized with a perovskite structure while the SiO 2 matrix was still in an amorphous state. Transmission electron microscopy confirmed that the PZT particles were of nanosize with perovskite structure and dispersed within the SiO 2 matrix. Photoluminescence spectra of the samples were measured between 10 and 290 K. The pure silica matrix showed an emission band at 3.20 eV and a weak emission band at 2.65 eV. They were noticeably suppressed in the PZT/SiO 2 nanocomposites. An additional emission band at ∼2.30 eV, due to transition within the PZT crystallites, was identified. This emission band showed a large blue-shift with decreasing PZT crystallite size and a substantially enhanced intensity as compared with that of bulk PZT ceramics. Our studies demonstrate the typical quantum size effect of ferroelectric-doped nanocomposites and the large influence of the silica matrix on the PL intensity of the embedded PZT particles.
URI: http://hdl.handle.net/10397/10201
DOI: 10.1088/0957-4484/19/03/035702
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