Preparation of Eu-doped β- and 15R-SiAlONs by ammonia nitridation of the precursor obtained using aluminum glycine gel

Masubuchi, Yuji; Yoshikawa, Mitsue; Takeda, Takashi; Kikkawa, Shinichi

doi:10.1016/j.jallcom.2009.07.151

Cited by 9 publications

(13 citation statements)

References 31 publications

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“…This emission shoulder was also observed in the work of Masubuchi et al [24]. To understand this phenomenon, the Gaussian fitting for the emission spectra of the 1 mol% Eu-doped 15R-sialon products was conducted, as shown in Fig.…”

Section: Emission Mechanismsupporting

confidence: 75%

“…If this is the case, the Eu 2+ cations can be incorporated into these defects sites in 15R-sialon to generate luminescence. This possibility has been demonstrated in our laboratory [24]. In this preliminary study, Eu 2+ -doped 15R-sialon powders prepared by gel-nitridation and post-annealing were found to exhibit a blue emission under excitation at 254 nm.…”

Section: Introductionmentioning

confidence: 57%

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Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Zhu

Masubuchi

Motohashi

et al. 2010

Journal of Alloys and Compounds

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Section: Emission Mechanismsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 57%

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Zhu

Masubuchi

Motohashi

et al. 2010

Journal of Alloys and Compounds

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“…The reagent-grade chemicals of Si 3 N 4 (99.9%, KCL Co., Ltd., Saitama, Japan), Al 2 O 3 (99%, Kishida Chemical Co., Ltd., Osaka, Japan), AlN (99.9%, KCL Co., Ltd., Saitama, Japan), and Eu 2 …”

Section: Methodsmentioning

confidence: 99%

Disordered crystal structure of 16H-SiAlON, Si3−xAl5+xOxN9−x (x~2.6)

Suzuki

Banno

Asaka

et al. 2016

J. Ceram. Soc. Japan

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We prepared the 16H-SiAlON crystal with the general formula of Si 3¹x Al 5+x O x N 9¹x (Z = 2), and characterized it by X-ray powder diffraction, transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The x-value was determined to be 2.61(2) from the [Si:Al] molar ratios of [0.049(2):0.951 (2)]. The space group was found to be P6 3 /mmc (centrosymmetric) for the Si 0.39(2) Al 7.61(2) O 2.61(2) N 6.39(2) compound. The hexagonal unit-cell dimensions were a = 0.305831(7) nm, c = 4.29942(12) nm, and V = 0.348260(15) nm 3 . These values were in good accordance with the high correlation between the unit-cell dimensions and concentrations of octahedral layer in the unit cell, which was determined for AlN, 20H-AlON, 21R-AlON, and 27R-AlON in a previous study. The initial structural model was derived by the charge flipping method, and it was further refined by the multi-phase Rietveld method. The final structural model showed the positional disordering of two of the five types of (Si,Al) sites. The disordered crystal structure was successfully described as a statistical average of four types of domains with ordered atom configurations.

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“…The optical properties of the oxynitrides in the UV-vis range have been explained by the coexistence of nitride and oxide anions together because of the more covalent nature in nitride ion [13]. Much research on phosphor materials for LED applications has been conducted on silicon oxynitride and alumino-silicon oxynitrides as host materials [14][15][16]. However, study on (oxy)nitrides of especially aluminum is limited to systems such as AlN:Eu, spinel-type AlON:Mg,Mn, and BaAl 11 O 16 N:Eu [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1−xAlO4−xNx oxynitrides

Masubuchi

Hata

Motohashi

et al. 2014

Journal of Alloys and Compounds

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Novel gadolinium calcium aluminum oxynitrides, Gd 1+x Ca 1-x AlO 4-x N x , were prepared in x = 0.15-0.25 by the solid state reaction of a nitrogen-rich mixture with AlN as an aluminum source; the mixture was sintered twice at 1500C for 5 h under 0.5 MPa of nitrogen gas. Shift in the optical absorption edge was observed in their diffuse reflectance spectra from 4.4 eV for the oxide (x = 0) to 2.9 eV for the oxynitride at x = 0.2. The crystal structure of Gd 1.2 Ca 0.8 AlO 3.8 N 0.2 at x = 0.2 was refined using a synchrotron x-ray diffraction data as a layered K 2 NiF 4 -type structure with the I4mm space group. Longer Al-O/N bond lengths in the oxynitride than those in GdCaAlO 4 suggest that the nitride ions are in the apical site of aluminum polyhedron, similar to those in Nd 2 AlO 3 N.

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Preparation of Eu-doped β- and 15R-SiAlONs by ammonia nitridation of the precursor obtained using aluminum glycine gel

Cited by 9 publications

References 31 publications

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Disordered crystal structure of 16<i>H</i>-SiAlON, Si<sub>3−</sub><i><sub>x</sub></i>Al<sub>5+</sub><i><sub>x</sub></i>O<i><sub>x</sub></i>N<sub>9−</sub><i><sub>x</sub></i> (<i>x</i>~2.6)

Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1−xAlO4−xNx oxynitrides

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Preparation of Eu-doped β- and 15R-SiAlONs by ammonia nitridation of the precursor obtained using aluminum glycine gel

Cited by 9 publications

References 31 publications

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

Disordered crystal structure of 16<i>H</i>-SiAlON, Si<sub>3&minus;</sub><i><sub>x</sub></i>Al<sub>5+</sub><i><sub>x</sub></i>O<i><sub>x</sub></i>N<sub>9&minus;</sub><i><sub>x</sub></i> (<i>x</i>~2.6)

Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1−xAlO4−xNx oxynitrides

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Disordered crystal structure of 16<i>H</i>-SiAlON, Si<sub>3−</sub><i><sub>x</sub></i>Al<sub>5+</sub><i><sub>x</sub></i>O<i><sub>x</sub></i>N<sub>9−</sub><i><sub>x</sub></i> (<i>x</i>~2.6)