塩化アンモニウム共存下におけるユウロピウム(II)付活炭酸カルシウム蛍光体の合成とその蛍光特性

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This paper reports about synthesis and fluorescence properties of Eu (II) doped vaterite phosphor emitting blue color by black light irradiation. Eu (III) doped vaterite phosphor was synthesized by a liquid phase reaction by adding 0.1 mol・dm^<-3> (NH_4)_2CO_3 solution into 0.10 mol・dm^<-3> CaCl_2 solution including EuCl_3 at 35℃. On the other hand, Eu^<2+> doped vaterite phosphor formed by heating mixture of Eu^<3+> doped vaterite and NH_4Cl. The upper limit of the incorporation of Eu^<3+> ion in vaterite structure was Eu/Ca atomic ratio of 0.01. Eu^<2+> doped vaterite phosphor could be also obtained by reduction of Eu^<3+> doped vaterite phosphor using NH_4Cl. Optimum synthetic conditions for Eu^<2+> doped vaterite phosphor with Eu/Ca atomic ratio 0.01 were : heating temperature of 350℃, time of 50 min and amount of NH_4Cl of 10 mass%. Emission wavelength of Eu^<2+> doped vaterite phosphor excited with 339 nm light was observed at about 427 nm and the emitted color was blue.
社団法人日本セラミックス協会の論文
2003-05-01