Crystallization properties of RE-doped (RE=Eu, Er, Tm) Zn2TiO4 prepared by the sol–gel method

Mrázek, Jan; Spanhel, L.; Surýnek, Martin; Potel, M.; Matejec, Vlastimil

doi:10.1016/j.jallcom.2011.01.009

Cited by 24 publications

(14 citation statements)

References 25 publications

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“…Such a structural properties are typical for nanocrystalline xerogels whose crystallization mechanism proceeds in the manner of homogeneous nucleation with constant rate of nucleation. Similar structural properties has been already demonstrated on zinc titanates [20].…”

Section: Nucleation Process and Crystal Growthsupporting

confidence: 85%

Sol–gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications

Mrázek

Potel

Buršı́k

et al. 2015

Materials Chemistry and Physics

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International audienceWe present a generic sol–gel approach for the preparation of nanocrystalline Dy2Ti2O7. This approach allows the preparation of powders and highly transparent thin films having nanocrystals of a tailored size. The thermal evolution of these nanocrystals was followed by conventional structural methods and furthermore, we determine both the kinetic parameters of the nanocrystal nucleation process from amorphous xerogel as well as the crystallization mechanism. The crystallization temperature was 798 ± 2 °C. The nanocrystal growth started by homogeneous nucleation with a constant nucleation rate followed by three dimensional growth. The activation energy of the crystallization was 780 kJ mol−1, and the energy of nanocrystal growth was 24.4 kJ mol−1. We demonstrate the existence of pure pyrochlore structure of Dy2Ti2O7 with the lattice parameter a equal to 10.2 Å. The structural evolution of nanocrystalline thin films was identical to that of the evolution of xerogels. A thin film of thickness 342 nm exhibited an optical transmission of 93.39% with a refractive index of 2.138 at 935 nm. These results provide fundamental information about the crystallization behavior of Dy2Ti2O7: they can be used to prepare pure nanocrystalline xerogels and highly transparent thin films with tailored structural properties which are suitable for photonic application

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Section: Nucleation Process and Crystal Growthsupporting

confidence: 85%

Sol–gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications

Mrázek

Potel

Buršı́k

et al. 2015

Materials Chemistry and Physics

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“…The luminescence properties of Eu-doped solids have been intensively investigated during the past decade [2][3][4][5][6][7]. In recent years, Eu 2+ -doped phosphors have been paid great attentions due to the significant applications as phosphors in white light-emitting diodes (W-LEDs), for example, the nitrides and oxynitrides-based compounds have been demonstrated to be excellent for W-LEDs application [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A new yellowish-green-emitting phosphor: Eu2+-doped K4CaSi3O9

Yuan

Wang

Tsuboi

et al. 2012

Journal of Alloys and Compounds

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“…The site symmetry at which the RE ions are situated in the host lattice is a key parameter that provides information on the emission wavelength and intensity. The local site symmetry around the RE ion has been reported to depend on several parameters, such as the host lattice, activator concentration, type of activator ion, and sintering temperature [4][5][6]. For instance, Lima et al [4] synthesized Eu 3+ -containing ZnO films from Pechini's solution and observed the strongest red emission at 613 nm upon excitation at 392 nm, indicating that the Eu 3+ ions were not in the symmetry centers of the ZnO host lattice.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Mrazek et al [5] reported the synthesis of RE-doped Zn 2 TiO 4 phosphor by using the single-batch sol-gel method, wherein the RE elements substituted for zinc ions in the crystal lattice. In addition, the RE element supports the nucleation process, leading to the formation of smaller and more uniform nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescent properties of Eu3+-doped ZnO phosphors

Cho

2015

Journal of the Korean Physical Society

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Eu 3+ -doped ZnO phosphors were prepared with different concentrations of Eu 3+ ions by using a solid-state reaction method. The synthesized samples were systematically characterized by using X-ray diffraction (XRD), scanning electron microscopy, and photoluminescence spectroscopy. The XRD patterns indicate that the intensity of the ZnO (101) peak gradually increases with increasing concentration of Eu 3+ ions, with an additional Eu2O3 (222) diffraction peak appearing in samples with Eu 3+ concentrations above 2 wt%. All of the phosphor samples, irrespective of the concentration of Eu 3+ ion, show a dominant red emission centered at 612 nm, which originates from the 5 D0 → 7 F2 electric dipole transition of the Eu 3+ ion. This suggests that the Eu 3+ ions are mainly situated in the asymmetry centers of the host lattice.

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Crystallization properties of RE-doped (RE=Eu, Er, Tm) Zn2TiO4 prepared by the sol–gel method

Cited by 24 publications

References 25 publications

Sol–gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications

Sol–gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications

A new yellowish-green-emitting phosphor: Eu2+-doped K4CaSi3O9

Synthesis and luminescent properties of Eu3+-doped ZnO phosphors

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