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Research article - Peer-reviewed, 2010

Simple and Efficient Synthesis of a Nd: LaAlO3 NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln(2)Al(2)((OPr)-Pr-i)(12)((PrOH)-Pr-i)(2) Single Source Precursors by Bradley Reaction

Pazik, Robert; Seisenbaeva, Gulaim; Gohil, Suresh; Wiglusz, Rafal; Kepinski, Leszek; Strek, Wieslaw; Kessler, Vadim


Nanoparticles of a Nd-doped LaAlO3 perovskite can be obtained rapidly and with quantitative yield using the Bradley (ether elimination) treatment of a mixture of individual Ln(2)Al(2)((OPr)-Pr-i)(12)((PrOH)-Pr-i)(2), Ln = La, Nd, in acetophenone. The initially produced particles are poorly crystalline, but their crystallinity improves strongly on heating to 800 degrees C, which leads also to a controllable aggregation, The prepared nanoparticles are rather solution stable and can easily be surface-modified, which opens prospects for their use as phosphors in bioimaging applications. The precursors, bimetallic isopropoxides of rare earth elements and aluminum with a 1:1 composition, Ln(2)Al(2)((OPr)-Pr-i)(12)((PrOH)-Pr-i)(2), can be prepared with high yields via direct dissolution of metallic lanthanoids in a solution of aluminum isopropoxide in a toluene - isopropanol medium or through a short time reflux of "Ln((OPr)-Pr-i)3" with 1 equiv of Al((OPr)-Pr-i)(3) in toluene. In spite of good volatility and their proper composition, the Ln(2)Al(2)((OPr)-Pr-i)(12)((PrOH)-Pr-i)(2), Ln = La, Nd,do not act as single-source precursors in MOCVD, because of their quantitative transformation into LnAl(3)((OPr)-Pr-i)(12) together with Ln(5)O((OPr)-Pr-i)(13) on evaporation. These molecules are, however, present intact in solution according to variable temperature NMR studies, which permits application of them successfully as single source precursors in the synthesis of Ln:LaAlO3 perovskite nanopowders with compositions thoroughly controlled through the conditions of the synthesis. Luminescent properties of the Nd:LaAlO3 were examined and discussed in detail. The thermal population of the F-4(5/2) and H-2(9/2) states was found as a consequence of the grain size effect causing difficulties in heat dissipation. Moreover, luminescence behavior of the powder annealed at a lowest temperature shows well-defined short-range order.

Published in

Inorganic Chemistry
2010, volume: 49, number: 6, pages: 2684-2691

Authors' information

Pazik, Robert
Swedish University of Agricultural Sciences, Department of Chemistry
Swedish University of Agricultural Sciences, Department of Chemistry
Swedish University of Agricultural Sciences, Department of Chemistry
Wiglusz, Rafal
Kepinski, Leszek
Strek, Wieslaw
Swedish University of Agricultural Sciences, Department of Chemistry

UKÄ Subject classification

Environmental Sciences related to Agriculture and Land-use
Food Science

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