Effects of B2O3 and SiO2 on the persistent luminescence property of CaAl2O4:Eu2+,Nd3+

CaAl2O4:Eu2+,Nd3+, CaAl2O4:Eu2+,Nd3+·0.02B2O3 and CaAl2O4:Eu2+,Nd3+·0.02SiO2 with persistent luminescence were prepared by a high-temperature state reaction in a reductive atmosphere. The effects of B3+ and Si4+ on the luminescence of CaAl2O4:Eu2+,Nd3+ were studied. The emission spectra of these three kinds of phosphors are very similar. CaAl2O4:Eu2+,Nd3+·0.02SiO2 has the highest initial luminance, but it decays very quickly. CaAl2O4:Eu2+,Nd3+·0.02B2O3 has the higher initial luminance and decays more slowly compared to CaAl2O4:Eu2+,Nd3+, and exhibits a much better persistent luminescence property. Those different effects can be described to different structural trap levels induced by B3+ and Si4+ doping, which has been conformed by thermoluminescence (TL) methods.