【摘 要】
：
M0.2Ca0.8TiO3∶Pr3+(M=Mg2+, Sr2+, Ba2+, Zn2+) long persistence red phosphors were prepared by solid state reaction. The influence of the partially replacing Ca2
【机 构】
：
School of Materials and Chemical Engineering
论文部分内容阅读
M0.2Ca0.8TiO3∶Pr3+(M=Mg2+, Sr2+, Ba2+, Zn2+) long persistence red phosphors were prepared by solid state reaction. The influence of the partially replacing Ca2+ in CaTiO3 with Mg2+, Sr2+, Ba2+, Zn2+ on the excitation spectra, the emission spectra and the long persistence properties were studied. The results suggest that certain quantity of Mg2+, Sr2+, Ba2+, Zn2+ which partially replace Ca2+ can enhance the luminescent intensity and prolong the afterglow persistence of the samples. The intensity of Mg0.2Ca0.8TiO3∶Pr3+ is above all of the samples. Take Mg0.2Ca0.8TiO3∶Pr3+ as the basic sample, the influence of Pr3+ concentrations(C(Pr3+)) on the long afterglow properties were also studied. The results suggest that when the C(Pr3+) is 0.10%(mol fraction) the intensity of the sample is the highest. The excitation spectra of all these samples show broad band spectra ranging from 300～500 nm peaking at about 342 nm. The emission spectra also exhibit a broad band peaking at 613 nm(CaTiO3∶Pr3+ is 612 nm). XRD research indicates that the crystalline phases change due to the replacement of divalent metal ions.The research on the thermoluminescence spectra of Mg0.2Ca0.8TiO3∶Pr3+ indicates that the peak is at 107.35 ℃ and the depth of the trap energy is about 0.852 eV.
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