TITLE

Photoluminescence of transparent strontium–barium–niobate-doped silica nanocomposites

AUTHOR(S)
Lu, S. G.; Mak, C. L.; Wong, K. H.; Cheah, K. W.
PUB. DATE
December 2001
SOURCE
Applied Physics Letters;12/24/2001, Vol. 79 Issue 26, p4310
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Optically transparent nanocomposites of strontium–barium–niobate (SBN) and silica were fabricated via a novel sol–gel method. The nanocomposites were annealed in temperatures of 600–800 °C to yield the nanometer-sized tetragonal tungsten–bronze phase of SBN crystallites. Photoluminescence studies at temperatures from 10 K to room temperature were performed. The undoped silica matrix showed a strong emission band at 3.2 eV and a weak emission band at 2.65 eV. They were noticeably suppressed in our SBN/SiO[sub 2] nanocomposites. Extra sharp peaks on top of the 3.2 eV band were seen. An additional emission band at 2.3 eV due to transitions within the NbO[sub 6] complex of SBN crystallites was also observed. This emission band showed a large blueshift with decreasing SBN crystallite size. This demonstrates that the photoluminescence spectra of ferroelectric-doped silica nanocomposites have a strong dependence on crystallite size. © 2001 American Institute of Physics.
ACCESSION #
5742055

 

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