Synthesis and characterization of Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ phosphor

Rui Chen¹，Donghua Chen²

1. College of Chemistry and Chemical Engineering,Yunnan Normal University2. Hubei Key Laboratory for Catalysis and Material Scince,College of Chemistry and Material Science,South Central University for Nationalities

摘 要：Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ phosphors were synthesized by solid-state reaction technique. The crystalline phase and luminescence performances of Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ were observed by X-ray powder diffractometer（XRD）, transmission electron microscope（TEM）, photoluminescence spectrometer and brightness meter, respectively. The addition of Ag⁺ can diminish in the crystal particle sizes of Ca_0.9Mg_0.1TiO₃:Pr³⁺. Because Ag+ can reduce the concentration of the undesirable defects in the phosphor, luminescence intensity of Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ is 2.3 times as high as that of Ca_0.9Mg_0.1TiO₃:Pr³⁺at the same preparation condition. The effect of Ag+ on the persistent afterglow properties is to deepen the energy storage traps and enhance the energy transfer efficiency from Ca_0.9Mg_0.1TiO₃ to Pr³⁺. The persistent afterglow properties of Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ are better than those of Ca_0.9Mg_0.1TiO₃:Pr³⁺ at the same preparation condition. In conclusion,Ca_0.9Mg_0.1TiO₃:Pr³⁺,Ag⁺ phosphor with molar ratio of Ag⁺to Pr³⁺ 3:1 obtained at 900 ℃ for 4 h exhibits the optimal photoluminescence performances.

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