Preparation and properties of europium-doped phosphosilicate glasses obtained by the sol–gel method

Ávila, Lilian R.; Nassor, Evelisy Cristina de Oliveira; Pereira, Paula Fabiana dos Santos; Cestari, Alexandre; Ciuffi, Kátia J.; Calefi, Paulo S.; Nassar, Eduardo J.

doi:10.1016/j.jnoncrysol.2008.04.038

Cited by 25 publications

(14 citation statements)

References 21 publications

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“…Therefore, it can be considered a standard to measure the relative intensity of the other bands 22 . The fact that the intensity ratio presents lower values for the hybrids indicates that Eu 3+ ions are located in sites with a lower symmetry, and these results are observed in other works [23][24][25] . The infrared spectra of the samples are shown in Figure 5 The spectra of the materials display bands associated with the vibrations of both inorganic and organic structural units.…”

Section: Resultssupporting

confidence: 83%

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

et al. 2011

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This work describes the hydrolytic sol-gel synthesis of silica particles prepared by a modified Stöber route, using the organofunctionalized alkoxide 3-methacryloxypropyl trimethoxysilane and tetraethylorthosilicate. The silica particles were obtained through basic catalysis from a mixture of precursor alkoxides, water, and isopropyl alcohol. Samples were prepared with change to the pre-hydrolysis and condensation time of tetraethylortosilicate, followed by addition of the organosilane 3-methacryloxypropyl trimethoxysilane. Eu 3+ ions were added to the alkoxides mixture, in order to obtain structural information about the silica particles. The samples were centrifuged, washed with ethanol, and dried at 50 °C. The xerogel was analyzed by thermogravimetric analysis, photoluminescence, transmission electron microscopy, and infrared spectroscopy. The photoluminescence spectra revealed Eu 3+ lines characteristic of the ion 5 D 0 → 7 F J (J = 0, 1, 2, 3, 4) transition. The thermogravimetric curve and infrared spectra confirmed the presence of the alkoxide organic group and water in the materials. Transmission electron microscopy showed spherical particles with varied size. The time of pre-hydrolysis and condensation as well as the addition of 3-methacryloxypropyl trimethoxysilane affect the final shape and size of the materials, so they can be used as control factors.

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Section: Resultssupporting

confidence: 83%

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

et al. 2011

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“…[29] Therefore, the outstanding optical properties from the direct f-f transitions of the 4f shell are mainly excited by the effect of the high symmetry of the inner coordination sphere rather than the by energy transfer derived from n-π* transitions. D 0 Ǟ 7 F 0 transition indicates that the Eu III ions in 1-6 may be not located at sites with C 1 , C nv , C n , or C s symmetry, [30] in good agreement with the single-crystal data. Moreover, such ideal colorimetric purity has not been found in other lanthanide complexes owing to their intrinsically complicated energy levels.…”

Section: Spectroscopic Measurementssupporting

confidence: 78%

Structures and Properties of Luminescent Pentanitratoeuropate(III) Ionic Liquids

Zhao

Tang

et al. 2014

Eur J Inorg Chem

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A series of luminescent ionic liquids based on pentanitratoeuropate(III) anions combined with imidazolium cations, namely, 1,2,3-trimethylimidazolium (6)}, were synthesized. These complexes were characterized by NMR and IR spectroscopy as well as elemental analysis. They exhibit high thermostability and wide liquidus ranges of more than 300°C. Colorless plate crystals of 1 were isolated, and the crystal structure was determined by single-crystal X-ray

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“…These materials have attracted considerable attention in the past years [1][2][3]. Zeolites, silica, and other matrices are being used as inorganic hosts to prepare hybrid nanocomposites [4][5][6][7][8][9][10]. These materials are extremely interesting because they combine the properties of their components in the interface, thus giving rise to composites with unique magnetic, photoluminescent, mechanical, optical, optoelectronic, conducting, and catalytic properties for specific applications in areas such as optoelectronics, catalysis, and biomaterials, among others [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents

Ávila

Faria

Ciuffi

et al. 2010

Journal of Colloid and Interface Science

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Preparation and properties of europium-doped phosphosilicate glasses obtained by the sol–gel method

Cited by 25 publications

References 21 publications

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Structures and Properties of Luminescent Pentanitratoeuropate(III) Ionic Liquids

New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents

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