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Structure, particle size, and annealing of gas phase-condensed Eu3+:Y2O3nanophosphors

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
171
Identifiers
DOI: 10.1016/s0022-4596(02)00140-8
Keywords
  • Nanoparticle
  • Europium
  • Yttria
  • Luminescence
  • Sintering
  • Size Dependence
  • Metastable Phase

Abstract

Abstract This paper reports the phase distribution and particle size of Eu 3+:Y 2O 3 nanoparticles prepared by gas-phase condensation as a function of preparation conditions and annealing. Annealing improves the crystallinity of the as-prepared nanoparticles but also increases the particle size. Gas-phase condensation at a low pressure (10 Torr) produces 5-nm Eu 3+:Y 2O 3 in multiple phases. Annealing the 5-nm nanoparticles produces single-phase material in the cubic structure with a doubling of the particle size. Higher chamber pressures produce larger particles. A pressure of 400 Torr produces 13-nm Eu 3+:Y 2O 3 in the monoclinic structure. Annealing the 13-nm particles produces a mixture of monoclinic and cubic phase material with a 50% increase in average particle size. We also report preliminary attempts to disperse Eu 3+:Y 2O 3 and Eu 2O 3 nanoparticles in different surfactant and polymer solutions.

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