Abstract
A series of electron capture materials Sr0.98-xAl2O4∶0.02Eu2 +,x Tm3 +( x = 0,0. 01,0. 02,0. 03,0. 04,0. 05) were synthesized by a conventional solid-state reaction method. The deeper new trap( TB) was introduced into the Sr Al2O4∶ Eu2 +phosphor lattice by the co-dopant of Tm3 +ions to optimize the properties of the ETM phosphor. Meanwhile,the trap concentration of intrinsic shallow trap( TA) was increased. The properties of photo-stimulated luminescence( PSL) and thermoluminescence( TL) in the series samples were investigated. It is found that TBis responsible for the performance of PSL. The most efficient initial PSL can be obtained when the co-doping mole fraction of Tm3 +is 0. 03,which keeps the correspondence with the strongest TL intensity of TB. Besides,the phosphors show a PSL afterglow under 980 nm stimulation,which can be ascribed to the re-trapping of TAas the electrons firstly excited from TBwill be re-trapped by the empty TAto generate the PSL afterglow.
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