Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method

Yusuke Shibuta; Takuya Hasegawa; Sun Woog Kim; Kazuyoshi Uematsu; Kenji Toda; Mineo Sato

doi:10.1016/j.jallcom.2019.02.295

Mild condition synthesis without high temperature process of Eu²⁺-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method

Yusuke Shibuta, Takuya Hasegawa, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

IMRAM - Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A green-emissive Ba₂SiO₄:Eu²⁺ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 °C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba₂SiO₄ was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)₂·8H₂O and amorphous SiO₂. In addition, the results of X-ray powder diffraction gave evidence that the Ba₂SiO₄ phase was formed through a Ba₂[SiO₂(OH)₂]₂ phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15–20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f⁶5d¹→4f⁷ transition of Eu²⁺ under the near UV excitation of 360 nm. The result indicates that Eu³⁺ is partly reduced to Eu²⁺ without using reduction gas.

Original language	English
Pages (from-to)	1009-1012
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	788
DOIs	https://doi.org/10.1016/j.jallcom.2019.02.295
Publication status	Published - 2019 Jun 5

Keywords

BaSiO:Eu
Low temperature synthesis
Nanophosphors
Water-Assisted Solid-State Reaction method

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10.1016/j.jallcom.2019.02.295

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title = "Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method",

abstract = "A green-emissive Ba2SiO4:Eu2+ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 °C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4 was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)2·8H2O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4 phase was formed through a Ba2[SiO2(OH)2]2 phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15–20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f65d1→4f7 transition of Eu2+ under the near UV excitation of 360 nm. The result indicates that Eu3+ is partly reduced to Eu2+ without using reduction gas.",

keywords = "BaSiO:Eu, Low temperature synthesis, Nanophosphors, Water-Assisted Solid-State Reaction method",

author = "Yusuke Shibuta and Takuya Hasegawa and Kim, {Sun Woog} and Kazuyoshi Uematsu and Kenji Toda and Mineo Sato",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = jun,

day = "5",

doi = "10.1016/j.jallcom.2019.02.295",

language = "English",

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T1 - Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method

AU - Shibuta, Yusuke

AU - Hasegawa, Takuya

AU - Kim, Sun Woog

AU - Uematsu, Kazuyoshi

AU - Toda, Kenji

AU - Sato, Mineo

PY - 2019/6/5

Y1 - 2019/6/5

N2 - A green-emissive Ba2SiO4:Eu2+ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 °C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4 was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)2·8H2O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4 phase was formed through a Ba2[SiO2(OH)2]2 phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15–20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f65d1→4f7 transition of Eu2+ under the near UV excitation of 360 nm. The result indicates that Eu3+ is partly reduced to Eu2+ without using reduction gas.

AB - A green-emissive Ba2SiO4:Eu2+ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 °C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4 was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)2·8H2O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4 phase was formed through a Ba2[SiO2(OH)2]2 phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15–20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f65d1→4f7 transition of Eu2+ under the near UV excitation of 360 nm. The result indicates that Eu3+ is partly reduced to Eu2+ without using reduction gas.

KW - BaSiO:Eu

KW - Low temperature synthesis

KW - Nanophosphors

KW - Water-Assisted Solid-State Reaction method

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ER -

Mild condition synthesis without high temperature process of Eu²⁺-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method

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Keywords

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