Emission Properties from ZnO Quantum Dots Dispersed in SiO{sub 2} Matrix

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3606317· OSTI ID:21608131

Panigrahi, Shrabani; Basak, Durga ^[1]

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1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India)

Dispersion of ZnO quantum dots in SiO{sub 2} matrix has been achieved in two techniques based on StOeber method to form ZnO QDs-SiO{sub 2} nanocomposites. Sample A is formed with random dispersion by adding tetraethyl orthosilicate (TEOS) to an ethanolic solution of ZnO nanoparticles and sample B is formed with a chain-like ordered dispersion by adding ZnO nanoparticles to an already hydrolyzed ethanolic TEOS solution. The photoluminescence spectra of the as-grown nanocomposites show strong emission in the ultraviolet region. When annealed at higher temperature, depending on the sample type, these show strong red or white emission. Interestingly, when the excitation is removed, the orderly dispersed ZnO QDs-SiO{sub 2} composite shows a very bright blue fluorescence visible by naked eyes for few seconds indicating their promise for display applications.

• OSTI ID: 21608131
• Journal Information: AIP Conference Proceedings, Vol. 1349, Issue 1; Conference: 55. DAE solid state physics symposium 2010, Manipal (India), 26-30 Dec 2010; Other Information: DOI: 10.1063/1.3606317; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ANNEALING
COMPOSITE MATERIALS
EMISSION SPECTROSCOPY
EXCITATION
FLUORESCENCE
MATRICES
PHOTOLUMINESCENCE
QUANTUM DOTS
RANDOMNESS
SILICATES
SILICON OXIDES
ULTRAVIOLET RADIATION
ZINC OXIDES
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY-LEVEL TRANSITIONS
HEAT TREATMENTS
LUMINESCENCE
MATERIALS
NANOSTRUCTURES
OXIDES
OXYGEN COMPOUNDS
PHOTON EMISSION
RADIATIONS
SILICON COMPOUNDS
SPECTROSCOPY
ZINC COMPOUNDS