Melt synthesis of oxide phosphors with K2NiF4 structures: CaLa1−xEuxGaO4
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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−xEuxGaO4 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.
KeywordsGa2O3 Lattice Energy Solid State Synthesis Complex Perovskite K2NiF4
The authors are thankful to Mr. K. Seki and Mr. E. Nishimura, Tokyo Institute of Technology and Mr. Hosoume, Niigata University for their helps in the experiments. This work was partially supported by cooperative funds from the Materials and Structures Laboratory, Tokyo Inst. of Tech.
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