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Issue 22, 2008
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The observation of quantum confinement enhancement of the luminescence of nanocystalline (Y0.95Tb0.05)2O3 synthesized by alkalide reduction

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Abstract

Nanocrystalline (Y0.95Tb0.05)2O3 has been synthesized by sub-ambient homogenous reduction using alkalide solutions, subsequent oxidation and annealing. As synthesized, the material consists of free flowing, agglomerates of ill-defined, amorphous or subnanocrystalline nanoparticles. Samples annealed at 500 °C or greater are crystalline, consisting of agglomerated nanocrystals. The nanocrystals grow from an average of ∼1–2 nm to 19 nm and the agglomerates break-up as the annealing temperature is raised from 500 to 1000 °C. The nanocrystalline product displays luminescence typical of the Tb3+ ion. The photoluminescence intensity of the green 5D47F4 transition increases with increasing annealing temperature, reaching a maximum of 4% for the nanophosphor annealed at 1000 °C. Evidence of quantum confinement luminescence enhancement is observed for the nanocrystallites annealed at 500 °C, but the quantum efficiency is low, presumably due to their very small size and consequent rapid surface recombination. The results of this study suggest that nanocrystallites of (Y0.95Tb0.05)2O3 with a large quantum confinement fluorescence enhancement may be accessible by appropriate annealing in the temperature range 500–600 °C.

Graphical abstract: The observation of quantum confinement enhancement of the luminescence of nanocystalline (Y0.95Tb0.05)2O3 synthesized by alkalide reduction

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Publication details

The article was received on 21 Jan 2008, accepted on 20 Mar 2008 and first published on 08 Apr 2008


Article type: Paper
DOI: 10.1039/B801038B
J. Mater. Chem., 2008,18, 2540-2544

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    The observation of quantum confinement enhancement of the luminescence of nanocystalline (Y0.95Tb0.05)2O3 synthesized by alkalide reduction

    O. Zivkovic and M. J. Wagner, J. Mater. Chem., 2008, 18, 2540
    DOI: 10.1039/B801038B

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