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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