Blue-yellow multicolor phosphor, Eu2+-activated Li3NaSiO4: Excellent thermal stability and quenching mechanism

Masato Iwaki; Shota Kumagai; Shoma Konishi; Atsuya Koizumi; Takuya Hasegawa; Kazuyoshi Uematsu; Atsushi Itadani; Kenji Toda; Mineo Sato

doi:10.1016/j.jallcom.2018.10.299

Blue-yellow multicolor phosphor, Eu²⁺-activated Li₃NaSiO₄: Excellent thermal stability and quenching mechanism

Masato Iwaki, Shota Kumagai, Shoma Konishi, Atsuya Koizumi, Takuya Hasegawa, Kazuyoshi Uematsu, Atsushi Itadani, Kenji Toda, Mineo Sato

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

16 Citations (Scopus)

Abstract

A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu²⁺/Mn²⁺ and Eu²⁺/Tb³⁺/Mn²⁺. In this study, novel multicolor phosphor materials Li₃NaSiO₄:Eu²⁺ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu²⁺ ions are substituted for two cation sites, NaO₆ and LiO₅. Moreover, Eu²⁺-doped Li₃NaSiO₄ phosphors exhibit excellent thermal stability in comparison with Eu²⁺-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures.

Original language	English
Pages (from-to)	1016-1024
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	776
DOIs	https://doi.org/10.1016/j.jallcom.2018.10.299
Publication status	Published - 2019 Mar 5
Externally published	Yes

Keywords

Alkaline sites
Eu-activated phosphor
Good thermal stability
Multicolor emission phosphor

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Blue-yellow multicolor phosphor, Eu²⁺-activated Li₃NaSiO₄ : Excellent thermal stability and quenching mechanism. / Iwaki, Masato; Kumagai, Shota; Konishi, Shoma; Koizumi, Atsuya; Hasegawa, Takuya; Uematsu, Kazuyoshi; Itadani, Atsushi; Toda, Kenji; Sato, Mineo.

In: Journal of Alloys and Compounds, Vol. 776, 05.03.2019, p. 1016-1024.

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

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title = "Blue-yellow multicolor phosphor, Eu2+-activated Li3NaSiO4: Excellent thermal stability and quenching mechanism",

abstract = "A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu2+/Mn2+ and Eu2+/Tb3+/Mn2+. In this study, novel multicolor phosphor materials Li3NaSiO4:Eu2+ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu2+ ions are substituted for two cation sites, NaO6 and LiO5. Moreover, Eu2+-doped Li3NaSiO4 phosphors exhibit excellent thermal stability in comparison with Eu2+-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures.",

keywords = "Alkaline sites, Eu-activated phosphor, Good thermal stability, Multicolor emission phosphor",

author = "Masato Iwaki and Shota Kumagai and Shoma Konishi and Atsuya Koizumi and Takuya Hasegawa and Kazuyoshi Uematsu and Atsushi Itadani and Kenji Toda and Mineo Sato",

note = "Funding Information: This work was partly supported by JSPS KAKENHI Grant Number 17H03124 and Number 17H03386 . Publisher Copyright: {\textcopyright} 2018 Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

year = "2019",

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doi = "10.1016/j.jallcom.2018.10.299",

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T2 - Excellent thermal stability and quenching mechanism

AU - Iwaki, Masato

AU - Kumagai, Shota

AU - Konishi, Shoma

AU - Koizumi, Atsuya

AU - Hasegawa, Takuya

AU - Uematsu, Kazuyoshi

AU - Itadani, Atsushi

AU - Toda, Kenji

AU - Sato, Mineo

N1 - Funding Information: This work was partly supported by JSPS KAKENHI Grant Number 17H03124 and Number 17H03386 . Publisher Copyright: © 2018 Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/3/5

Y1 - 2019/3/5

N2 - A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu2+/Mn2+ and Eu2+/Tb3+/Mn2+. In this study, novel multicolor phosphor materials Li3NaSiO4:Eu2+ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu2+ ions are substituted for two cation sites, NaO6 and LiO5. Moreover, Eu2+-doped Li3NaSiO4 phosphors exhibit excellent thermal stability in comparison with Eu2+-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures.

AB - A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu2+/Mn2+ and Eu2+/Tb3+/Mn2+. In this study, novel multicolor phosphor materials Li3NaSiO4:Eu2+ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu2+ ions are substituted for two cation sites, NaO6 and LiO5. Moreover, Eu2+-doped Li3NaSiO4 phosphors exhibit excellent thermal stability in comparison with Eu2+-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures.

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KW - Multicolor emission phosphor

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