JOES: An application software for Judd-Ofelt analysis from Eu3+ emission spectra

Effect of particle size and dopant concentration on the Raman and the photoluminescence spectra of TiO2:Eu3+ nanophosphor thin films

Particle size effects on the structure and emission of Eu 3+ :LaPO 4 and EuPO 4 phosphors

The unique properties and numerous applications of nanocrystalline titanium dioxide (TiO2) are stimulating research on improving the existing and developing new titanium dioxide synthesis methods. In this work, we demonstrate for the first time the possibilities of the extraction–pyrolytic method (EPM) for the production of nanocrystalline TiO2 powders. A titanium-containing precursor (extract) was prepared by liquid–liquid extraction using valeric acid C4H9COOH without diluent as an extractant. Simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA–DSC), as well as the Fourier-transform infrared (FTIR) spectroscopy were used to determine the temperature conditions to fabricate TiO2 powders free of organic impurities. The produced materials were also characterized by X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). The results showed the possibility of the fabrication of storage-stable liquid titanium (IV)-containing precursor, which provided nanocrystalline TiO2 powders. It was established that the EPM permits the production of both monophase (anatase polymorph or rutile polymorph) and biphase (mixed anatase–rutile polymorphs), impurity-free nanocrystalline TiO2 powders. For comparison, TiO2 powders were also produced by the precipitation method. The results presented in this study could serve as a solid basis for further developing the EPM for the cheap and simple production of nanocrystalline TiO2-based materials in the form of doped nanocrystalline powders, thin films, and composite materials.

/pdf/extraction-pyrolytic-method-for-tio2-polymorphs-production-59u7p6hm9i.pdf

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

A series of new red phosphors based on apatite-type gadolinium silicate host, Gd9.33−xEux(SiO4)6O2 (0.03 < x < 1.87), have been synthesised and analysed. The phosphors show excellent chemical and thermal stability, losing only 10% of their emission intensity at 150 °C (working LED temperature) relative to that at room temperature through the electric dipole–dipole interaction. They exhibit efficient Eu3+ narrow-band red emission (quantum yield up to 75%; full-width at half-maximum (FWHM) = 7 nm; CIE colour coordinates x = 0.65, y = 0.35) of exceptional colour purity (94.2%), and the host can be heavily doped with Eu3+ (up to 10 at%) without concentration quenching of the emission. Variable-temperature powder X-ray diffraction, photoluminescence spectroscopy and Judd–Ofelt analysis of the phosphors’ radiative properties reveal the favourable influence of the structural properties of the apatite-type host on the efficiency and thermal stability of the Eu3+-activated Gd9.33(SiO4)6O2 emission.

/pdf/narrow-band-red-phosphors-of-high-colour-purity-based-on-eu3-327n37n45c.pdf

Narrow-band red phosphors of high colour purity based on Eu3+-activated apatite-type Gd9.33(SiO4)6O2

1College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China 2Institute of Physics, University of Tartu, Tartu 50411, Estonia 3Institute of Physics, Jan Dlugosz University, PL-42200 Czestochowa, Poland 4Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland 5University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, Belgrade 11001, Serbia

Judd–Ofelt Analysis of Eu 3+ Emission in TiO 2 Anatase Nanoparticles

The Corrosion Behavior of an Ag43Cu37Zn20 Alloy in the Natural Seawaters

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Judd–Ofelt Analysis of Eu 3+ Emission in TiO 2 Anatase Nanoparticles

The Corrosion Behavior of an Ag43Cu37Zn20 Alloy in the Natural Seawaters