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Nb5+ doped Ca0.8Zn0.2TiO3:Pr3+ red long afterglow phosphors were synthesized by solid-state reaction methods. X-ray diffraction, photoluminescence spectroscopy and thermally stimulated spectrometry were used to investigate the effects of Nb5+ content on the crystal characteristics and luminescent properties of Ca0.8Zn0.2Ti1-xNbxO3:Pr3+ phosphors. The results showed that the addition of a small quantity of Nb5+ had negligible effect on the crystal characteristics of Ca0.8Zn0.2Ti1-xNbxO3:Pr3+, but it could change the trapping parameters (the depth of trap, frequency factors and the concentration of trapped charges at t=0) of Ca0.8Zn0.2Ti1-xNbxO3:Pr3+ phosphors, and then led to the enhance-ment of red fluorescence and phosphorescence at 612 nm originating from 1D2→3H4 transition of Pr3+. Both of the red fluorescence intensity and afterglow time reached the largest values in the sample of Ca0.8Zn0.2Ti1-xNbxO3:Pr3+ with x=0.05. The afterglow time of Ca0.8Zn0.2Ti0.95Nb0.05O3:Pr3+ phosphors lasted for over 24 min (≥1 mcd/m2) when the excited source was cut off.
Nb5 + doped Ca0.8Zn0.2TiO3: Pr3 + red long afterglow phosphors were synthesized by solid-state reaction methods. X-ray diffraction, photoluminescence spectroscopy and thermally stimulated spectrometry were used to investigate the effects of Nb5 + content on the crystal characteristics and luminescent properties of Ca0.8Zn0.2Ti1-xNbxO3: Pr3 + phosphors. The results showed that the addition of a small quantity of Nb5 + had negligible effect on the crystal characteristics of Ca0.8Zn0.2Ti1-xNbxO3: Pr3 +, but it could change the trapping parameters (the depth of trap, frequency factors and concentration of trapped charges at t = 0) of Ca0.8Zn0.2Ti1-xNbxO3: Pr3 + phosphors, and then led to the enhance ment of red fluorescence and phosphorescence at 612 nm originating from 1D2 → 3H4 transition of Pr3 +. Both of the red fluorescence intensity and afterglow time reached the largest values in the sample of Ca0.8Zn0.2Ti1-xNbxO3: Pr3 + with x = 0.05. The afterglow time of Ca0.8Zn0.2Ti0.95Nb0.05O3: Pr3 + phosphors lasted for over 24 min (≥1 mcd / m2) when the excited source was cut off.