Synthesis of Ca-α-SiAlON phosphors by a mechanochemical activation route

Xu, Xin; Tang, Jialei; Nishimura, Toshiyuki; Lu, Hao

doi:10.1016/j.actamat.2010.11.021

Cited by 40 publications

(18 citation statements)

References 52 publications

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“…In this way, the starting powders are transformed into an amorphous phase with homogeneity of elements at the atomic level and reduced particle size, which greatly enhances the reactivity [11]. On account of this advantage, this technique has been widely applied into the homogeneous metal alloy while seldom used in the synthesis of oxynitride phosphors [12][13][14][15][16]. The present work is to prepare one of AlON polymorphs, Al 10 O 3 N 8 as an example by HEBM method and investigate the structure and luminescence properties of Al 10 O 3 N 8 based phosphors.…”

Section: Introductionmentioning

confidence: 99%

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

et al. 2015

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“…Therefore, it can produce highly homogeneous precursors and equally homogeneous resultant powders. Currently, high-energy mechanical milling is also considered an effective process for synthesizing a variety of non-equilibrium nano-structured phases [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Si, N co-Doped Nano-Sized TiO2 with High Thermal Stability and Photocatalytic Activity by Mechanochemical Method

Wang

Wen

et al. 2018

Nanomaterials

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Τhe photocatalytic activity in the range of visible light wavelengths and the thermal stability of the structure were significantly enhanced in Si, N co-doped nano-sized TiO2, and synthesized through high-energy mechanical milling of TiO2 and SiO2 powders, which was followed by calcination at 600 °C in an ammonia atmosphere. High-energy mechanical milling had a pronounced effect on the mixing and the reaction between the starting powders and greatly favored the transformation of the resultant powder mixture into an amorphous phase that contained a large number of evenly-dispersed nanocrystalline TiO2 particles as anatase seeds. The experimental results suggest that the elements were homogeneously dispersed at an atomic level in this amorphous phase. After calcination, most of the amorphous phase was crystallized, which resulted in a unique nano-sized crystalline-core/disordered-shell morphology. This novel experimental process is simple, template-free, and provides features of high reproducibility in large-scale industrial production.

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“…From these quantitative evaluations, we identify problems and propose strategies for further improvement of combustion synthesis. and n = 1.2 [19], m = 1 and n = 1.8 [20], m = 2 and n = 1 [20], m = 2 and n = 0 [21] have been synthesized. In this study, we used the m = 2n as a compositional designing.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of Ca-α-SiAlON:Eu2+ phosphors with different Ca concentrations and diluent ratios

Saito

Kunisada

Sakaguchi

et al. 2017

Ceramics International

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Yellow Ca-α-SiAlON:Eu 2+ phosphors for white light-emitting diodes (LEDs) were synthesized by a facile combustion synthesis method using CaO, Eu 2 O 3 , α-Si 3 N 4 , Si, and Al as raw materials. Ca concentrations and diluent ratios were optimized to improve their luminescence properties. The lattice constant and luminescence properties improved as x increased from 0.4 to 1.2 in Ca x Si 12−(m+n) Al m+n O n N 16−n :Eu 0.06 . The optimum value was x = 1.2. Scanning transmission electron microscopy combined with energy dispersive X-ray analysis detected segregation of Ca and Eu at grain boundaries, which decreased luminescence behavior in the x = 1.4 sample. The influence of Si and Si 3 N 4 diluents was investigated by varying the diluent ratio φ = ). Changes in temperature and flame propagation speed were measured during combustion synthesis using two thermocouples. When φ was less than 0.5, the combustion temperature exceeded 1600 °C and the synthesized material contained an amount of the high-temperature β-SiAlON phase. At φ > 0.7, the reaction temperature fell below 1200 °C, and unreacted raw materials remained. The optimum value of φ was 0.6. The internal quantum efficiency of the product synthesized at x = 1.2 and φ = 0.6 was approximately 35% under 450-nm excitation. According to electron probe X-ray microanalysis, composition varied within individual synthesized particles, which may explain the decrease in emission behavior relative to a commercial product.

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Synthesis of Ca-α-SiAlON phosphors by a mechanochemical activation route

Cited by 40 publications

References 52 publications

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

Synthesis of Si, N co-Doped Nano-Sized TiO2 with High Thermal Stability and Photocatalytic Activity by Mechanochemical Method

Combustion synthesis of Ca-α-SiAlON:Eu2+ phosphors with different Ca concentrations and diluent ratios

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