Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Gonçalves, Roger; Moura, A. P. de; Godinho, Mário; Longo, Elson; Machado, Myrela O.; Castro, Dimitri; Li, Máximo Siu; Marques, A. P. A.

doi:10.1016/j.ceramint.2014.11.018

Cited by 35 publications

(19 citation statements)

References 35 publications

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“…The permanent dipoles of water are induced in solution and can produce a rapid heating of the system because they interact directly with microwaves. This kind of interaction is directly related to the water capacity for electromagnetic radiation absorption and efficiency in converting electromagnetic radiation to thermal energy [25][26][27][28] . Therefore, the reaction time and temperature necessary for obtaining of such materials in this work is significantly lower than those described in the literature [29][30][31][32] providing a significant improvement on crystallinity and morphology.…”

Section: Resultsmentioning

confidence: 99%

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

et al. 2016

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We present a study of the controlled synthesis and optical properties of single-crystals Gd(OH) 3 , GdOOH and Gd 2 O 3 nanorods. In this work, Gd(OH) 3 nanorods were synthesized by a simple and fast microwave-assisted hydrothermal method. This process combined with the thermal decomposition oxidation of Gd(OH) 3 nanorods as precursors enabled the preparation of single-crystalline GdOOH and Gd 2 O 3 structures with well-defined morphology at low temperatures. The crystal structure dependence on the optical properties was investigated. We observed a green shift effect on the photoluminescence (PL) emission spectra from Gd(OH) 3 to Gd 2 O 3 nanorods, which can be attributed to different types of surface defects, as well as intrinsic properties that contribute significantly to the modified PL behavior.

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Section: Resultsmentioning

confidence: 99%

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

et al. 2016

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“…Defects are generated to compensate for the extra positive charges of Pr 3+ ions occupying the Ca 2+ sites. First, this can result in the formation of negatively charged Ca vacancies, which act as nonradiative recombination centers [23]. Second, the extra positive charge that results from the incorporation of Pr 3+ can be accompanied by the generation of excess oxygen and/or a reduction in the number of oxygen vacancies.…”

Section: Photoluminescence Emission Of Catio 3 :Pr 3+ Crystalsmentioning

confidence: 99%

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Gonçalves

Lima

Godinho

et al. 2015

Ceramics International

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“…This process is very interesting in science and industries because it is energy-saving, rapid and of well-defined products with high purity, and environmentally friendly. It should be noted that the reaction is proceeding in a closed system and can be continuously processed [11][12][13]. But for the CH method, it requires longer time, typically half to several days, and high electrical power as high as 1000 W. The objective of this research was to prepare Ce 2 (MoO 4 ) 3 by microwavehydrothermal/solvothermal process and to further characterize the products by X-ray diffraction (XRD), electron microscopy and spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and photonic absorbance of Ce2(MoO4)3 nanocrystal synthesized by microwave–hydrothermal/solvothermal method

et al. 2016

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In this research, cerium (III) nitrate hexahydrate (Ce(NO 3 ) 3 Á6H 2 O) and ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 Á4H 2 O) with Ce 3? -to-Mo 6? molar ratio of 2:3 were dissolved in 40 ml different solvents of deionized (DI) water, polyethylene glycol (PEG) and ethylene glycol (EG) to form different solutions which were followed by adjusting pH from the traditional values to 7.0 and 10.0 with 1 molÁL -1 sodium hydroxide (NaOH). Subsequently, the solutions were processed by 270-W microwave-hydrothermal/solvothermal method. Phase, morphology, vibrational modes and photonic properties were fully characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectrophotometry, ultraviolet-visible (UV-Vis) absorption and photoluminescence (PL) spectroscopy. The as-synthesized products were pure cerium molybdenum oxide (Ce 2 (MoO 4 ) 3 ) of nanoparticles clustered together as nanoplates in DI water and PEG solvents, and of spindle-like nanoparticles in EG solvent, including the presence of Ce-O-H mode and MoO 4 units. The results show that direct energy gaps of the first two have the same value of 2.30 eV, and that of the last is 2.80 eV, including their blue emission at the same wavelength of 488 nm.

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Crystal growth and photoluminescence of europium-doped strontium titanate prepared by a microwave hydrothermal method

Cited by 35 publications

References 35 publications

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Photoluminescence and photonic absorbance of Ce2(MoO4)3 nanocrystal synthesized by microwave–hydrothermal/solvothermal method

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