The crystal-size and power dependence of luminescence properties of Nd<sup>3+</sup>:LaAlO 3 nanopowders

Stręk, W.; Hreniak, D.; Bednarkiewicz, A.; Mazur, Piotr; Dereń, P.J.; Łojkowski, Witold

doi:10.1117/12.553169

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The most intense luminescence of the Nd 3+ originates from the de-excitation of the 4 F 3/2 multiplet. In general, the results are consistent with those reported by Strek et al for nanopowders of the Nd 3+ doped LaAlO 3 obtained by the modified Pechini method. The comparison of the luminescence behavior of the Nd:LaAlO 3 single crystals described in detail by Dereń et al revealed the significant difference in the intensity ratio of the 4 F 3/2 → 4 I 9/2 and 4 F 3/2 → 4 I 11/2 .…”

Section: Resultssupporting

confidence: 92%

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

et al. 2010

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Nanoparticles of a Nd-doped LaAlO(3) perovskite can be obtained rapidly and with quantitative yield using the Bradley (ether elimination) treatment of a mixture of individual Ln(2)Al(2)(O(i)Pr)(12)((i)PrOH)(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)(O(i)Pr)(12)((i)PrOH)(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(O(i)Pr)(3)" with 1 equiv of Al(O(i)Pr)(3) in toluene. In spite of good volatility and their proper composition, the Ln(2)Al(2)(O(i)Pr)(12)((i)PrOH)(2), Ln = La, Nd, do not act as single-source precursors in MOCVD, because of their quantitative transformation into LnAl(3)(O(i)Pr)(12) together with Ln(5)O(O(i)Pr)(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:LaAlO(3) perovskite nanopowders with compositions thoroughly controlled through the conditions of the synthesis. Luminescent properties of the Nd:LaAlO(3) were examined and discussed in detail. The thermal population of the (4)F(5/2) and (2)H(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.

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Section: Resultssupporting

confidence: 92%

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

et al. 2010

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“…The increase of synthetic parameters, like concentration of Nd 3+ cations and sintering temperature, leads to the emission spectra comparable with the ground single crystal. Similar results were observed for the other type of nanoparticles whose host lattices show anisotropy of optical properties. , …”

Section: Resultssupporting

confidence: 84%

“…Similar results were observed for the other type of nanoparticles whose host lattices show anisotropy of optical properties. 32,33 The size effect is also reflected in the presence of the socalled hot emission band related to the ( 4 F 5/2 , 2 H 9/2 ) → 4 I 9/2 transitions (see inset in Figure 6, right). 34 This type of emission is the result of thermalization of the 4 F 3/2 level and promotion of electrons to the upper 4 F 5/2 , 2 H 9/2 levels.…”

Section: Resultsmentioning

confidence: 99%

Structural and Spectroscopic Characterization of Nd³⁺-Doped YVO₄Yttrium Orthovanadate Nanocrystallites

Wiglusz

Marciniak

Pązik

et al. 2014

Crystal Growth & Design

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Yttrium orthovanadate (YVO 4 ) nanoparticles doped with Nd 3+ ions (0.1−10 mol %), thermally treated at 700 to 1000 °C for 3 h were prepared using modified Pechini's technique. The structure of products were studied using standard X-ray diffraction (XRD) technique and Rietveld method. The average particle size was found to be about 20 nm (both XRD and transmission electron microscopy) for samples annealed at 700 °C, and further rapid growth was noticed above 900 °C. The spectroscopic behavior of the Nd 3+ :YVO 4 was studied in detailed based on the absorption, excitation, emission, and decay times measurements. The effect of the dopant concentration on progressive increase of reabsorption process and emission concentration quenching was observed. The size effect was manifested in the change of the relative intensities ratio for the resonant and laser transitions. In order to explain reverse behavior of the resonant line comparative studies with the Nd 3+ :YVO 4 single crystal were conducted. An increase of synthetic parameters, concentration of Nd 3+ cations and sintering temperature, leads to emission spectra comparable with the grinded single crystal.

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Symmetry of LaAlO3 nanocrystals as a function of crystallite size

Dereń

Lemański

Gągor

et al. 2010

Journal of Solid State Chemistry

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The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

Cited by 4 publications

References 14 publications

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

Structural and Spectroscopic Characterization of Nd³⁺-Doped YVO₄Yttrium Orthovanadate Nanocrystallites

Symmetry of LaAlO3 nanocrystals as a function of crystallite size

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The crystal-size and power dependence of luminescence properties of Nd3+:LaAlO 3 nanopowders

Cited by 4 publications

References 14 publications

Simple and Efficient Synthesis of a Nd:LaAlO3 NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln2Al2(OiPr)12(iPrOH)2 Single Source Precursors by Bradley Reaction

Simple and Efficient Synthesis of a Nd:LaAlO3 NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln2Al2(OiPr)12(iPrOH)2 Single Source Precursors by Bradley Reaction

Structural and Spectroscopic Characterization of Nd3+-Doped YVO4Yttrium Orthovanadate Nanocrystallites

Symmetry of LaAlO3 nanocrystals as a function of crystallite size

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The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

Simple and Efficient Synthesis of a Nd:LaAlO₃ NIR Nanophosphor from Rare Earth Alkoxo-Monoaluminates Ln₂Al₂(OⁱPr)₁₂(ⁱPrOH)₂ Single Source Precursors by Bradley Reaction

Structural and Spectroscopic Characterization of Nd³⁺-Doped YVO₄Yttrium Orthovanadate Nanocrystallites