HYDROTHERMAL SYNTHESIS OF NOVEL CERIUM (III) AND MANGANSE(II) ACTIVATED CALCIUM HYDROGENPHOSPHATE ANHYDRATE PHOSPHORS EMITTING BY BLACK LIGHT IRRADIATION

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The present work was investigated about hydrothermal synthesis of Ce³⁺ and Mn²⁺ activated calcium hydrogenphosphate anhydrate (CaHPO₄:Ce³⁺,Mn²⁺) phosphors. CaHPO₄:Ce³⁺,Mn²⁺ was a novel unprecedented phosphor, which was synthesized by hydrothermal treatment of dipping amorphous calcium phosphate (ACP) in formic acid aqueous solution. The emission intensity of the CaHPO₄:Ce³⁺,Mn²⁺ phosphor was affected remarkably by synthetic conditions such as Ce/Ca and Mn/Ca atomic ratio, concentration of formic acid, temperature and aging time. The optimum conditions for the synthesis of CaHPO₄:Ce³⁺,Mn²⁺ phosphor were follows; Ce/Ca atomic ratio, 0.01; Mn/Ca atomic ratio, 0.02; concentration of formic acid, 1.0 mol·dm^-3, hydrothermal temperature, 170°C; retention time, 0 h.