Doping effects of Nb5+ on red long afterglow phosphor CaTiO3:Pr3+ |
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Authors: | Jiang Zi-Qiang Wang Yu-Hua and Gong Yu |
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Institution: | Department of Materials Science, School of Physical Science and Technology,Lanzhou University, Lanzhou 730000, China |
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Abstract: | A series of Nb5+ codoped red long afterglow
phosphors CaTi1-xNbxO3:Pr 0.0023+ (0
≤ x ≤ 0.05) is prepared by a solid state reaction method. Their
photoluminescence, phosphorescence and thermoluminescence are
investigated. The results indicate that codoping Nb5+ can
improve the photoluminescence and phosphorescence property of
CaTiO3:Pr3+ significantly. When 3-mol% Nb5+ is
codoped, the emission intensity of CaTiO3:Pr3+ is
enhanced twice, while the afterglow time is extended from 10 min to
about 40 min. Thermoluminescence results reveal that the trapping
level of CaTiO3:Pr3+ is reduced from 0.82~eV to 0.62~eV
by codoping Nb5+. The effect of Nb5+ doping on
enhancing the photoluminescence intensity and afterglow time of
CaTiO3:Pr3+ is discussed. |
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Keywords: | CaTiO3:Pr3+ red afterglow trap |
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