Blue-yellow multicolor phosphor, Eu^sup 2+^-activated Li^sub 3^NaSiO^sub 4^: Excellent thermal stability and quenching mechanism

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 succe...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-03, Vol.776, p.1016
Main Authors: Iwaki, Masato, Kumagai, Shota, Konishi, Shoma, Koizumi, Atsuya, Hasegawa, Takuya, Uematsu, Kazuyoshi, Itadani, Atsushi, Toda, Kenji, Sato, Mineo
Format: Article
Language:English
Subjects:
Chemical synthesis
Electron traps
Emission
Emissions
Europium
Luminescence
Manganese ions
Near ultraviolet radiation
Phosphors
Phosphorus
Quenching
Silica
Thermal stability
Ultraviolet radiation
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Summary: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.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.10.299