Synthesis, crystal structure, optical and adsorption properties of BaAl2O4: Eu2+, Eu2+/ L3+ (L = Dy, Er, Sm, Gd, Nd, and Pr) phosphors

Rafiaei, Seyed Mahdi; Dini, Ghasem; Bahrami, Abbas

doi:10.1016/j.ceramint.2020.05.106

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…The following study aimed to extend the applicability of UPA and the impregnation method to the synthesis of a large variety of binary compounds with the composition MAl 2 O 4 , including cations M = Co, Ni, Zn, Ba. Functional properties of these compounds, having found numerous application fields (insulators, , catalysts, ,, pigments, , and optical materials ,, ), will not be considered in this study. An advantage of the UPA impregnation route, which we intend to demonstrate, is that it can be easily adapted to different compositions of metal oxide nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Spiridigliozzi

Rouleau

Kanaev

et al. 2023

Ind. Eng. Chem. Res.

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We report on a controlled synthesis of MAl2O4 (M = Mg, Co, Ni, Zn, Ba) nanopowders. The method includes three main steps: (i) growth of ultraporous nanofibrous Al2O3 (UPA) monoliths and their preliminary thermal treatment to remove the adsorbed and structural water, (ii) liquid-phase M-nitrate impregnation, and (iii) heat treatment allowing to form desirable nanocrystallites. Small crystallites with a spinel structure and mean size below 10 nm were obtained in Mg, Ni, and Zn aluminates after heat treatment at 500 °C. The results suggest formation of fully inverse MgAl2O4 spinels (inversion degree I ≈ 1) after the heat treatment at temperatures below 700 °C, followed by defect healing and formation of a normal spinel (I ∼ 0.3) at higher temperatures above the onset of the UPA bulk mass transport of ∼850 °C. This behavior is due to the interplay between cation diffusion and phase nucleation processes, in agreement with Ostwald’s rule. The formation of metastable spinel phases in agreement with Ostwald’s rule was confirmed after insertion of Co2+, Zn2+ (inverse spinel), and Ni2+ (normal spinel) cations. The insertion of Ba2+ cations into the UPA precursor resulted in the stuffed tridymite phase. The nanopowder synthesis route after upgrading to a large scale can contribute to the fabrication of functional materials for radiation-tolerant optics (M = Mg, Zn), catalysis (M = Ni, Co), nanophosphors (M = Ba), etc.

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Section: Resultsmentioning

confidence: 99%

Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Spiridigliozzi

Rouleau

Kanaev

et al. 2023

Ind. Eng. Chem. Res.

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“…The use of carbon powder in high-temperature solid reactions to form CO atmosphere is a simple way with low cost and high safety. It is used in many Eu 2+ -doped phosphors [8,9,10] . A new efficient synthesis route of SrAl2B2O7:Eu 2+ without 5%H2/95%N2 reduction atmosphere was explored, and the effect of Li + doped on the luminescence properties of SrAl2B2O7:Eu 2+ was also studied.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and fluorescence properties of SrAl₂B₂O₇:Eu²⁺ and SrAl₂B₂O₇:Eu²⁺, Li⁺

Li,

Jiao,

Guo

et al. 2023

J. Phys.: Conf. Ser.

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The blue-emitting phosphor SrAl2B2O7:Eu2+ has the potential to be used in full-spectrum LED devices. However, the reducing atmosphere is extremely demanding in the complex preparation process of SrAl2B2O7:Eu2+. Thereby, the synthesis of SrAl2B2O7:Eu2+ with an economic approach is important. In this work, a new synthesis route was realized; SrAl2O4:Eu2+ and H3BO3 were used as solid precursors to synthesize SrAl2B2O7:Eu2+ by solid-state reaction method, and only carbon powder is needed as a source of reducing atmosphere. The effects of different synthesis routes on the crystal structure, morphology, and luminescence properties of SrAl2O4:Eu2+ were studied, as well as the effects of Li+ doping on luminescence properties were investigated. The results show that under the new synthesis route, SrAl2B2O7:Eu2+ has good luminescence properties, and doping Li+ will improve the luminescence intensity.

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“…Yin et al (2020) reported a BaAl 2 O 4 :Eu 2+ -Al 2 O 3 composite ceramic to enhance the luminescence output. Rafiaei et al (2020) reported the synthesis, crystal structure and optical and adsorption properties of BaAl 2 O 4 :Eu 2+ , Eu 2+ /L 3+ (L = Dy, Er, Sm, Gd, Nd, and Pr) phosphors. As BaAl 2 O 4 doped with rare earths has significant application in luminescent phosphors, in this report we propose a powerful analysis method to help researchers improve their manufacturing methods.…”

Section: Introductionmentioning

confidence: 99%

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping

Lin

Chen

et al. 2022

J Synchrotron Radiat

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This study develops and successfully demonstrates visualization methods for the characterization of europium (Eu)-doped BaAl2O4 phosphors using X-ray nanoprobe techniques. X-ray fluorescence (XRF) mapping not only gives information on the elemental distributions but also clearly reveals the valence state distributions of the Eu2+ and Eu3+ ions. The accuracy of the estimated valence state distributions was examined by performing X-ray absorption spectroscopy (XAS) across the Eu L 3-edge (6.977 keV). The X-ray excited optical luminescence (XEOL) spectra exhibit different emission lines in the selected local areas. Their corresponding emission distributions can be obtained via XEOL mapping. The emission properties can be understood through correlation analysis. The results demonstrate that the main contribution to the luminescence intensity of the Eu-doped BaAl2O4 comes from the Eu2+ activator and the emission intensity will not be influenced by the concentration of Eu2+ or Eu3+ ions. It is anticipated that X-ray nanoprobes will open new avenues with significant characterization ability for unravelling the emission mechanisms of phosphor materials.

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Synthesis, crystal structure, optical and adsorption properties of BaAl2O4: Eu2+, Eu2+/ L3+ (L = Dy, Er, Sm, Gd, Nd, and Pr) phosphors

Cited by 12 publications

References 36 publications

Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis, characterization, and fluorescence properties of SrAl₂B₂O₇:Eu²⁺ and SrAl₂B₂O₇:Eu²⁺, Li⁺

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping

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Synthesis, crystal structure, optical and adsorption properties of BaAl2O4: Eu2+, Eu2+/ L3+ (L = Dy, Er, Sm, Gd, Nd, and Pr) phosphors

Cited by 12 publications

References 36 publications

Synthesis of MAl2O4(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis of MAl2O4(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis, characterization, and fluorescence properties of SrAl2B2O7:Eu2+ and SrAl2B2O7:Eu2+, Li+

Visualizing the valence states of europium ions in Eu-doped BaAl2O4 using X-ray nanoprobe mapping

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Product

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Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis of MAl₂O₄(M = Mg, Co, Ni, Zn, Ba) Nanopowders by Liquid Impregnation of Nanofibrous Alumina

Synthesis, characterization, and fluorescence properties of SrAl₂B₂O₇:Eu²⁺ and SrAl₂B₂O₇:Eu²⁺, Li⁺

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping