Synthesis and characterization of Ca0.9Mg0.1TiO3:Pr3+,Ag+ phosphor

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 °C for 4 h exhibits the optimal photoluminescence performances.