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

S. G. Lu; C. L. Mak; K. H. Wong; K. W. Cheah

doi:10.1063/1.1427419

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

S. G. Lu^*, C. L. Mak, K. H. Wong, K. W. Cheah

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Journal article › peer-review

12 Citations (Scopus)

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/SiO₂ 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 NbO₆ 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.

Original language	English
Pages (from-to)	4310-4312
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	26
DOIs	https://doi.org/10.1063/1.1427419
Publication status	Published - 24 Dec 2001

Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1427419

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@article{28caa9ba93c14b1c986c14bcaf88f0f0,

title = "Photoluminescence of transparent strontium-barium-niobate-doped silica nanocomposites",

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/SiO2 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 NbO6 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.",

author = "Lu, {S. G.} and Mak, {C. L.} and Wong, {K. H.} and Cheah, {K. W.}",

note = "This work was supported by the Research Grant Council of the Hong Kong Special Administrative Region, under Grant No. PolyU5049/97P and the Center of Smart Materials of the Hong Kong Polytechnic University. ",

year = "2001",

month = dec,

day = "24",

doi = "10.1063/1.1427419",

language = "English",

volume = "79",

pages = "4310--4312",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "26",

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T1 - Photoluminescence of transparent strontium-barium-niobate-doped silica nanocomposites

AU - Lu, S. G.

AU - Mak, C. L.

AU - Wong, K. H.

AU - Cheah, K. W.

N1 - This work was supported by the Research Grant Council of the Hong Kong Special Administrative Region, under Grant No. PolyU5049/97P and the Center of Smart Materials of the Hong Kong Polytechnic University.

PY - 2001/12/24

Y1 - 2001/12/24

N2 - 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/SiO2 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 NbO6 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.

AB - 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/SiO2 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 NbO6 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.

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U2 - 10.1063/1.1427419

DO - 10.1063/1.1427419

M3 - Journal article

AN - SCOPUS:0035945094

SN - 0003-6951

VL - 79

SP - 4310

EP - 4312

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

ER -

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

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