Tailoring of room temperature excitonic luminescence in sol-gel zinc oxide-silica nanocomposite films

S. Chakrabarti, D. Das, D. Ganguli, S. Chaudhuri

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Zinc oxide-silica (ZnO/SiO 2 = 20:80, molar ratio) nanocomposites consisting of ZnO nanoparticles embedded in a dielectric matrix were prepared by a sol-gel technique (spin coating). Optical transmittance, Raman effect and photoluminescence measurements of the composites indicated effective capping of the ZnO nanoparticles (radii 1.4-1.5 nm) in the host showing practically no variation of particle size with the post-deposition-annealing treatments. The blue shift of the band gap (4.23-4.29 eV) from that of bulk ZnO (3.3 eV) indicated strong carrier confinement for samples annealed at T≤773 K. Highly intense UV emission (approx. 4.2 eV) at room temperature could be obtained by annealing the composites in static oxygen atmosphere, while the visible defect-related luminescence (approx. 2.62 and 2. 43 eV) could be reduced, resulting in a high intensity ratio (approx. 27) of the two.

LanguageEnglish
Pages228-237
Number of pages10
JournalThin Solid Films
Volume441
Issue number1-2
DOIs
Publication statusPublished - 22 Sep 2003

Fingerprint

Zinc Oxide
Nanocomposite films
Zinc oxide
Silicon Dioxide
zinc oxides
Sol-gels
Luminescence
nanocomposites
Silica
gels
Annealing
luminescence
Nanoparticles
silicon dioxide
nanoparticles
annealing
composite materials
Opacity
Composite materials
Spin coating

Keywords

  • Luminescence
  • Nanostructures
  • Optical properties
  • Zinc oxide

Cite this

Chakrabarti, S. ; Das, D. ; Ganguli, D. ; Chaudhuri, S. / Tailoring of room temperature excitonic luminescence in sol-gel zinc oxide-silica nanocomposite films. In: Thin Solid Films. 2003 ; Vol. 441, No. 1-2. pp. 228-237.
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Tailoring of room temperature excitonic luminescence in sol-gel zinc oxide-silica nanocomposite films. / Chakrabarti, S.; Das, D.; Ganguli, D.; Chaudhuri, S.

In: Thin Solid Films, Vol. 441, No. 1-2, 22.09.2003, p. 228-237.

Research output: Contribution to journalArticle

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AU - Chakrabarti, S.

AU - Das, D.

AU - Ganguli, D.

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