Photoluminescence of Eu3+, Tb3+ and Tm3+-doped transparent SiO2–Al2O3–LiF–GdF3 glass ceramics

Lakshminarayana, G.; Qiu, Jianrong

doi:10.1016/j.jallcom.2008.09.068

Cited by 48 publications

(17 citation statements)

References 25 publications

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“…It is possible that the produced series of bands may be due to the presence of Eu . These results were obtained during a study of aluminosilicates doped with Eu cations [20]. Our hypothesis is based on the fact that, as was shown [21,22], natural aluminosilicates can contain impurities of rare-earth elements, in particular, Eu 3+ ions.…”

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confidence: 75%

Photoluminescence of montmorillonite clay minerals modified by cetyltrimethylammonium bromide

et al. 2011

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The structure and photoluminescent properties of natural montmorillonite (MMT) aluminosilicates from three mineral deposits that were modified by cations of sodium or the surfactant cetyltrimethylammonium bromide (CTAB) have been investigated. X-ray fluorescence analysis showed significant differences in the concentrations of the inorganic dopants in these materials. An x-ray diffraction analysis established that incorporation of the CTA + long-chain cations into the MMTs expands remarkably the mineral interplanar distances, the values of which are close to each other for all organoclay samples under study and equal to 1.8-2.0 nm. The photoluminescent properties of the Na-form of the MMTs are shown to depend on the amount of introduced dopant capable of either enhancing or quenching the emission. Deposition of CTAB on the mineral surface influences the luminescence pattern, the spectral contour and wavelength range being practically the same for all modified samples. The emission may intensify or weaken because of such surface modification.Introduction. Natural layered clay minerals (CM) with the 2:1 structure type are highly disperse and have a large specific surface area. They are known to be selective sorbents and effective ion-exchangers [1, 2], active catalysts for various processes (isomerization, polymerization, addition, etc.[3]), fillers of organic media, plastifiers of polymeric materials [4-8], etc. The particles of these CM are stratified in a liquid medium. Their thickness is of the order of nanometers; the width/length, 25-1000 nm. Their surface is organophobic in the unaltered state. Owing to the presence in the CM interplanar space of metal cations that are susceptible to ion exchange, it is rather easy to convert the surface into an organophilic one via exchange of the inorganic cations by organic ones using ion exchange. As a result, the affinity of the resulting organoclays for an organic medium [polymers, liquid crystals (LC), aromatic compounds, etc.] increases sharply. Heterocomposites with a homogeneous structure (coagulation network) consisting of nanoparticles of the organoclay and the organic matrix are formed at a certain concentration of them. For example, LC filled with CM particles modified by various surfactants (SA) exhibit a variety of electro-optical properties [9][10][11].The starting CM in the present work was montmorillonite (MMT) from three deposits: Pyzhev (Ukraine), Cherkassy (Ukraine), and Askan (Georgia). MMT is a layered natural aluminosilicate of the 2:1 structure type that consists of two layers of SiO 2 tetrahedra between which a layer of Al 2 O 3 octahedra is located. These samples differ in the impurity profile, dispersion, cation-exchange capacity (CEC), and magnitude of surface charge. This should affect their properties (in particular, optical ones). We studied two series of these CM. One of them was the Na-form of the samples; the other, MMT modified with an organic molecule. The organic surface modifier was cetyltrimethylammonium bromide (CTAB) because this SA...

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confidence: 75%

Photoluminescence of montmorillonite clay minerals modified by cetyltrimethylammonium bromide

et al. 2011

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“…The research of rare earth ion doped energy upconversion materials has triggered active interest for its potential applications in the optical devices such as color display, planar waveguides, communication fibers and immunoassay [1][2][3][4][5][6]. The fact that the rare earth ions have a plenty of energy levels provoking these ions emitting a wide range spectra covering near infrared (NIR) to ultraviolet (UV), however, this excellent phenomenon itself means a negative point which makes it difficult to obtain single color emission such as pure red upconversion emission which has potential applications in color display and visual search [7].…”

Section: Introductionmentioning

confidence: 99%

Pure red upconversion emission from Yb3Al5O12 phase doped with high Er3+ concentration

Yang

Ren

et al. 2010

Journal of Alloys and Compounds

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“…Optical properties of oxyfluoride transparent glass ceramic (TGC) doped with rare earth ions have attracted much attention in the design of optical device as lasers, fiber optics amplifiers and efficient upconverters [1][2][3][4]. TGC can be obtained when applied a precise heat treatment to the precursor glass.…”

Section: Introductionmentioning

confidence: 99%

The behavior of Er3+ dopants during crystallization in oxyfluoride silicate glass ceramics

Lin

Ren

Chen

et al. 2009

Journal of Alloys and Compounds

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Photoluminescence of Eu3+, Tb3+ and Tm3+-doped transparent SiO2–Al2O3–LiF–GdF3 glass ceramics

Cited by 48 publications

References 25 publications

Photoluminescence of montmorillonite clay minerals modified by cetyltrimethylammonium bromide

Photoluminescence of montmorillonite clay minerals modified by cetyltrimethylammonium bromide

Pure red upconversion emission from Yb3Al5O12 phase doped with high Er3+ concentration

The behavior of Er3+ dopants during crystallization in oxyfluoride silicate glass ceramics

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