摘要
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 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.
基金
Project supported by the National Natural Science Foundation of China (51072128)
Key Research Project of Science and Technology of Shanxi (20110321040-01)
Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi
