Spherical BaMgAl10O17:Eu2+ Phosphor Particles by Liquid Phase Synthesis

Jung, Ha Kyun; Lee, Dae Won; Park, Yoon Chang

doi:10.4028/www.scientific.net/SSP.124-126.391

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Spherical BaMgAl₁₀O₁₇:Eu²⁺ Phosphor Particles by Liquid Phase Synthesis

Abstract:

To improve luminescent properties of the phosphor, spherical BaMgAl10O17:Eu2+ particles have been synthesized using a liquid phase reaction composed of two-stage precipitations. This phosphor particles exhibited uniform size (0.4 ㎛) with narrow distribution and were well-dispersed without agglomeration. The single phase of phosphor was formed by firing at the temperature of about 1350°C. The preparation conditions in this synthetic process for spherical BaMgAl10O17:Eu2+ particles were optimized on the basis of emission intensity by the excitation at 147 nm. The emission spectra showed the typical broad band due to the transition of Eu2+ activator from 4f65d1 to 4f7 in BaMgAl10O17:Eu2+. The maximum emission intensity for this spherical blue phosphor was obtained by reduction treatment at 1450°C.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Main Theme:

Advances in Nanomaterials and Processing

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

391-394

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.391

Citation:

H. K. Jung et al., "Spherical BaMgAl₁₀O₁₇:Eu²⁺ Phosphor Particles by Liquid Phase Synthesis", Solid State Phenomena, Vols. 124-126, pp. 391-394, 2007

Online since:

June 2007

Authors:

Ha Kyun Jung, Dae Won Lee, Yoon Chang Park

Keywords:

Blue Emission, Luminescence, Phosphor, Precipitation, Spherical

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$38.00

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References

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Paper TitlePages

Sol-Gel Preparation and Characterizations of Europium-Ion Doped Barium Magnesium Aluminate

Authors: Chung Hsin Lu, Chien Hao Huang, Chung Tao Chen, Sheng Min Wang, Shu Jiuan Huang, Dorcas Zhang, Ramakant Kadam

Abstract: The photoluminescent properties of BaMgAl10O17: Eu2+ synthesized via a sol-gel process employing citric acid (CA) and ethylene glycol (EG) were investigated in this study. The photoluminescence intensity of Eu2+ emission increased with increase in the doping concentration of Eu2+ up to 15 at %. The photoluminescence intensity of BaMgAl10O17: Eu2+ also varied with the EG: CA ratio. SEM investigation indicates that the sol-gel derived particles exhibited an irregular shape. The EPR studies showed that Eu2+ ions occupied the sites with non-cubic symmetry in the prepared phosphors.

Improvement of Luminescent Properties of Phosphor Powders Coated with Nanoscaled SiO₂ by Atomic Layer Deposition

Authors: Hyu Suk Kim, Hyug Jong Kim, Hyung Su Kim, Young Kyu Jeong, Suk Hwan Kim, Sang Woo Lee, Bong Kyo Jeong, Hyuoung Ho Lee, Byung Ho Choi

Abstract: An investigation is reported by coating BaMgAl10O17:Eu2+ phosphor by silicon oxide using catalyzed atomic layer deposition. Nanoscaled SiO2 films were prepared at room temperature using tetraethoxysilane (TEOS), H2O and NH3 as precursors, reactant gas and catalyst, respectively. AES analysis showed the surface composition of coated phosphor was silicon oxide. In TEM and FE-SEM analysis, the growth rate was about 0.7 Å/cycle and the surface morphology became smoother and clearer than that of uncoated phosphor. The photoluminescence intensity (PL) increased up to 11.04% as ALD cycle increased up to 200 ALD cycle. This means that the reactive surface of uncoated phosphors is uniformly grown with stable silicon oxide to reduce the dead surface layer without change of bulk properties. Moreover, it is found that nanoscaled SiO2 films are quite effective for the improvement of the aging characteristics of photoluminescence.

375

Influence of Zinc-Zirconium Substitution on Magnetic Properties of Ba(ZnZr)_xFe_12-2xO₁₉ Hexaferrite Prepared by the Molten Salt Method

Authors: Hai Feng Li, Rong Zhou Gong, Xian Wang, Li Ren Fan, Gang He, Ming Zhong He, Ze Kun Feng

Abstract: M-type hexaferrites Ba(ZnZr)xFe12-2xO19 (x=0, 0.5, 1.0, 1.5) powders, have been synthesized by molten salt method, where x varies from 0 to 1.5 in steps of 0.5. X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and vibrating sample magnetometer(VSM) were used to analyze the structures and magnetic properties. The results showed that, the magnetoplumbite structures for all samples calcining at 1100°C have been formed. The magnetic hysteresis loop measurements of the hexagonal ferrites powders showed that the saturation magnetization (Ms), the remanent magnetization (Mr), and the coercitivity (Hc) of ferrites depend strongly on the chemical compositions of materials. The data showed that the max Hc was obtained when substitution of x=1.0 (Hc=63.9 Oe), while the best Ms was obtained when substitution of x=0.5 (Ms=54.02 emu/g). Zn and Zr substitutions greatly modified the magnetic properties of BaM hexaferrite.

2071

Luminescent Properties of Eu²⁺-Activated SrAl₂Si₂O₈as an Potential Blue Phosphor for near UV LED Chips

Authors: Li Jun Luo, Yi Wen Zhu, Ping Chen

Abstract: The phosphors SrAl₂Si₂O₈ doped with different Eu²⁺ concentration were prepared by solid-state reaction technique, and their photoluminescent properties at different temperature were investigated. With the increase of Eu²⁺ content, two emission bands can be observed and this can be interpreted as Eu²⁺ ions occupying two types of sites in the crystal lattice. And their lifetime is decreasing, this result can be due to energy transfer among Eu²⁺ ions nonradiately at higher concentration of Eu²⁺ ions in the host lattices. The phosphor SrAl₂Si₂O₈:0.40Eu shares intense blue emitting with broad excitation in the near-UV range. This phosphor may be an excellent blue phosphor for near ultraviolet InGaN-based white diodes.

956

Improving Blue Phosphor BAM:Eu for Fluorescent and LED Lighting

Authors: Gilles Wallez, Arnold Lacanilao, Valérie Buissette, Thierry Le Mercier, Léo Mazerolles, Bertrand Pavageau, Laurent Servant

Abstract: The effects of various fluoride fluxes on the crystallization of blue phosphor BaMgAl₁₀O₁₇:Eu²⁺ were characterized using a wide panel of experimental methods. LiF appeared as the most efficient, with a significant increase of the photoluminescence yield under excitation at 280 nm. Besides, the recrystallization resulted in a redistribution of the dopant among the three crystallographic sites, leading to a strong increase of the excitation in the near-UV domain. This allowed the emission to increase by 40 % under a 400 nm irradiation, typically of interest for possible LED-blue phosphor systems. At last, the shaping into hexagonal single crystals allowed both a reduction of the thermal degradation under air, and the discovery of a novel regeneration process at moderate temperature.

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