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Y2O2S:Eu3+nanocrystals, a strong quantum-confined luminescent system

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Publication Date
Volume
126
Issue
2
Identifiers
DOI: 10.1016/j.jlumin.2006.08.064
Keywords
  • Nanocrystals
  • Oxysulfide
  • Photoluminescence
  • Quantum Confinement
  • Europium
Disciplines
  • Physics

Abstract

Abstract Trivalent europium-doped yttrium oxysulfide nanocrystals synthesized using sol–gel thermolysis show significant blue shifts in the excitation bands corresponding to fundamental absorption, charge-transfer absorption. A significant blue shift observed in the fundamental absorption edge for the nanocrystals having an average crystallite size ( φ) in the range 9–15 nm indicates a strong quantum confinement with a Bohr exciton radius of 5–13 nm. Also, the diffuse reflectance spectra and the corresponding Kubelka–Munk plot indicate the possibility of profound decrease in the absorption coefficient of Eu 3+–ligand charge-transfer species necessitating further studies in this wide-gap semiconductor nanocrystalline system.

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