Synthesis and enhanced luminescence properties of Li-doped CaTiO3:Pr3+ ceramic phosphors

CaTiO3:Pr3+ and different concentrations (0.5 wt.% to 5.0 wt.%) of Li-doped CaTiO3:Pr3+ ceramic phosphor samples were prepared by means of solid state reaction method. The influence on crystallinity, surface morphology and luminescent properties of CaTiO3:Pr3+ ceramic phosphors by doping Li+ ions was investigated with the evidence of XRD, SEM, EDX and PL measurements. The luminescent spectra was dominated by a red emission peak at 613 nm radiated from the 1D2-3H4 transition of Pr3+ ions. The highest luminescent intensity was observed at 1.0 wt.% Li-doped CaTiO3:Pr3+ ceramic phosphor, and its peak intensity was improved by a factor of 3.5 in comparison with that of CaTiO3:Pr3+ ceramic. The increase of luminescence results not only from the improved crystallinity but also from the enhanced surface roughness. The luminescent intensity and surface roughness exhibited similar behavior as a function of Li+ ions concentration.