Melt synthesis of oxide phosphors with K2NiF4 structures: CaLa1-x Eu x GaO4

Tadashi Ishigaki, Kenji Toda, Tomoaki Watanabe, Naonori Sakamoto, Nobuhiro Matsushita, Masahiro Yoshimura

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In order to synthesize compounds of various Perovskite-related structures, we have utilized a novel "melt synthesis technique" for phosphors rather than the conventional solid state reaction techniques. The solid state reactions require multi-step processes of heating/cooling with intermediate grindings to make homogeneous samples. However, for the melt synthesis, it is possible to make a homogeneous sample in a single step within a short period of time (1-60 s) due to the liquid phase reaction in the molten samples, which were melted by strong light radiation in an imaging furnace. In this study, we have prepared a red-phosphor CaLaGaO4:Eu3+ which has a perovskite-related layered K2NiF4 structure. Well-crystallized CaLa1-x Eu x GaO4 samples with the K2NiF4 structure have been obtained up to x = 0.25, but there was the formation of an olivine phase when x = 0.5-1.0. The red emission at 618 nm increased with the increasing value of x up to x = 0.25.

Original languageEnglish
Pages (from-to)4749-4752
Number of pages4
JournalJournal of Materials Science
Issue number14
Publication statusPublished - 1 Jul 2008


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